KR101723839B1

KR101723839B1 - Semiconductor device, controller and system for asynchronous sirial communication

Info

Publication number: KR101723839B1
Application number: KR1020150123400A
Authority: KR
Inventors: 안진홍
Original assignee: 주식회사 듀얼리티
Priority date: 2015-09-01
Filing date: 2015-09-01
Publication date: 2017-04-06
Also published as: KR20170027017A

Abstract

The present invention discloses an asynchronous serial communication system and method, comprising: a semiconductor device having two terminals and being supplied with a voltage necessary for operation from data transmitted through one terminal; a semiconductor device having two terminals; A controller for performing serial communication, and a serial communication system and method for performing asynchronous serial communication between the semiconductor device and the controller for writing and reading data through one terminal.

Description

Technical Field [0001] The present invention relates to a controller and an asynchronous serial communication system,

The present invention relates to a semiconductor device, and more particularly, to a semiconductor device having two terminals and being supplied with a voltage required for operation from data transmitted through one terminal, a semiconductor device having two terminals, A controller for performing serial communication, and a serial communication system for performing asynchronous serial communication between the semiconductor device and the controller for writing and reading data through one terminal.

Semiconductor devices can be manufactured by applying various semiconductor technologies depending on the use.

For example, semiconductor devices such as semiconductor memories and system integrated circuits are fabricated by applying semiconductor technology to meet high performance and high integration. In this case, the manufacturing cost of the semiconductor device is high.

In contrast, there is a field in which semiconductor chips can implement desired chips at low cost. A semiconductor chip manufactured by a semiconductor technology capable of realizing an inexpensive price for a security chip, a medical disposable sensor, an environmental sensor, and a small precision industrial sensor. The semiconductor technology for this purpose is disclosed in U.S. Pat. Nos. 5,398,326 and 6,108,751 Can be illustrated as well.

Semiconductor devices in sensor fields such as medical disposable sensors and security chips are not required to have high performance in a circuit, have low power consumption, are small in size, and require simple contact with external systems.

As described above, a semiconductor device used as a sensor is important for price competitiveness, and it is required to provide a simple structure, a high-quality transmission rate, and various usability.

An object of the present invention is to realize a semiconductor device in which one terminal has two terminals shared for data communication and power supply.

Another object of the present invention is to realize a semiconductor device having a rectifying function for obtaining a power supply voltage from data.

It is another object of the present invention to provide a technique for performing data write and read through one pin by an asynchronous serial communication method.

Another object of the present invention is to provide a semiconductor device having two pins that generates a reference clock for asynchronous serial communication and realizes a technique of writing data supplied from an external controller using a reference clock, And to transmit data information generated in the semiconductor device to an external controller by minimizing the size of the semiconductor device.

It is still another object of the present invention to provide a controller for transferring data using pulses of a short interval in order to increase the efficiency of the rectifying function using data and a semiconductor device for normally restoring data transmitted using short- And realizes an asynchronous serial communication technology capable of improving errors in the data transfer process.

It is another object of the present invention to provide a technique for performing asynchronous serial communication and determining a read mode and a write mode according to code information included in data.

It is still another object of the present invention to provide a technique for generating a timing for determining a high or low state of data input in an asynchronous serial manner in a write mode using a data transmission time interval.

It is still another object of the present invention to provide a method and apparatus for generating a clock signal corresponding to a transmission time interval when a code indicating a read mode is included in data transmitted from outside, Sensing an internal data from an element array including at least one of a sensor element and a memory element formed by using a CMOS device, transmitting the sensed data to an output buffer to perform data communication with the external controller, And to return to the write mode after reading all the data.

It is still another object of the present invention to provide a semiconductor device which generates an output of a semiconductor device having two terminals in synchronization with a reference pulse signal sent from an external controller in a read mode, In order to realize the technology of sensing and discrimination in the environment.

It is still another object of the present invention to provide a semiconductor device having two terminals, in which data is transmitted from a data forming section to an output buffer in order to reduce the size of an output buffer necessary for a semiconductor device when outputting data, In order to realize a technique of alternately performing the operation of transmitting the data.

Another object of the present invention is to realize a technique in which a selected one of two terminals of a semiconductor device is shared for data communication and power supply according to a mode.

A semiconductor device of the present invention includes: a first terminal and a second terminal on a substrate; A rectifying circuit including a diode and a first capacitor; Wherein one of the first terminal and the second terminal is connected to a contact for inputting / outputting data of the CMOS device and is connected to the rectifying circuit, and a power source for charging the first capacitor, And a pulse signal synchronized at a data transition time is used to increase the efficiency of power supply to the input / output of the data.

The semiconductor device preferably includes an element array including at least one sensor element and a memory element corresponding to the sensing surface, and a circuit for processing the data generated on the sensing surface.

The semiconductor device of the present invention comprises: an input buffer for recognizing a pulse signal provided from the outside through one input / output line; A pulse signal restoring circuit for restoring the recognized pulse signal to an actual signal; A command decoder for recognizing a read mode code of the restored signal and providing a read command word; An address providing unit for providing an address to be read corresponding to the read mode; An element array for providing the data corresponding to the read command word and the designated address; An analog-to-digital converter for converting an analog signal output from the element array into a digital signal; A first in first out (FIFO) memory for sequentially storing and outputting data of a predetermined size outputted from the analog-to-digital converter; And an output buffer for outputting data of the chip memory through the input / output line.

A controller of the present invention includes: a voltage regulator for generating and providing a voltage necessary for operation of a semiconductor device having two terminals; An instruction decoder for providing data corresponding to an external transmission signal; A Baud Rate generator for generating a capture timing of data provided in the semiconductor device having the two pins; A pulse signal generator for providing a pulse signal for loading the data of the command decoder on one input / output line in accordance with the capture timing; An output buffer for outputting the pulse signal of the pulse signal generator to the semiconductor device through the one input / output line using the voltage of the voltage regulator; An input buffer for receiving a signal input from the semiconductor device through the one input / output line; And a converter for converting a signal of the input buffer into a data format recognizable by an external device.

An asynchronous serial communication method according to the present invention is a method for synchronizing an asynchronous serial communication signal in an asynchronous serial communication method using a ring oscillator and an oscillation signal which recognizes a pulse width of the first bit among a plurality of data bits following one bit, &Lt; / RTI > Generating a capture signal based on a transition point of the oscillation signal; And capturing the data bits using either a rising edge or a falling edge of the capture signal.

An asynchronous serial communication system of the present invention comprises: a controller having a first output buffer and a first input buffer sharing one input / output line; And a semiconductor device having a second output buffer and a second input buffer sharing the one input / output line, and a diode for charging a power source and a diode for transferring data of the input / output line to the capacitor, The first output buffer maintains the on state and the second output buffer maintains the off state, and the data is transferred to the capacitor through the diode, while the data is transferred to the capacitor through the diode, 2 input buffer, and when reading the data from the semiconductor device to the controller, the first output buffer is turned off while the second output buffer is turned on.

The asynchronous serial communication system of the present invention controls pull-up and pull-down of input / output lines, swings between an input / output reference voltage for controlling the pull-up and a reference voltage for controlling the pull-down, A controller for outputting a pulse signal corresponding to a time point to the input / output line; And a semiconductor device that performs a charge and write mode using the signal of the input / output line including the pulse signal.

The controller of the present invention includes: a pulse generator for generating a pulse corresponding to a transition point of the transmission signal when a transmission signal is inputted from the outside; An input / output voltage regulator maintaining the pull-up so that the input / output line maintains a predetermined input / output reference voltage or higher; And a pull-down control unit for performing pull-down on the input / output line in response to a pulse signal of the pulse generation unit, and stopping the pull-down when the voltage of the input / output line reaches a preset reference voltage, The voltage level of the line is returned by the pull-up, and the pulse signal that swings by the pull-up and the pull-down corresponding to the transmission signal is output to the input / output line.

The semiconductor device of the present invention receives a pulse signal swinging between preset first and second voltages corresponding to a transition point of an externally transmitted transmission signal from an controller through an input / output line, An input buffer for providing a signal corresponding to a difference between the pulse signal and the comparison voltage compared to the voltage; A pulse generating circuit for outputting a pulse having a transition point synchronized with the output of the input buffer; And a toggle flip-flop for recovering data having the same phase as the transmission signal using the pulse.

The controller of the present invention includes: an input / output voltage regulator that maintains a pullup so that an input / output line maintains an input / output reference voltage or higher; A pull-down control unit for performing the pull-down on the input / output line in response to a read command, and terminating the pull-down when the pull-down signal of the input / output line reaches a preset reference voltage; A pulse generating circuit for generating a constant pulse having an enable period of a predetermined width when the pull-down signal of the input / output line reaches the reference voltage; And a first transistor for disconnecting a connection between the input / output line and the input / output voltage regulator during the enable period of the constant pulse to float the input / output line. When data is transferred to the floating input / output line, And outputs the sensed data.

The asynchronous serial communication system of the present invention controls a pull-up and pull-down of an input / output line, swings between an input / output reference voltage for controlling the pull-up and a reference voltage for controlling the pull- Output line, a pull-down operation is performed corresponding to a read command, and when a pull-down signal of the input / output line reaches the reference voltage, a first constant pulse is generated, A controller for floating the input / output line during an enable period of the first constant pulse, and sensing and outputting data when the data is transferred to the input / output line being floated; And generating a second constant pulse when the pull-down signal of the input / output line reaches the reference voltage in response to the read command, and outputting the read data to the second And a semiconductor device for outputting the constant pulse through the input / output line during an enable period of the constant pulse.

Another aspect of the asynchronous serial communication system of the present invention is to control a pull-up and pull-down of an input / output line, swing between a reference voltage for controlling the pull-up and an input / output reference voltage for controlling the pull- Output line, a pull-up signal corresponding to a transmission signal or a transition of a read command is output to the input / output line, and the pull-up operation is performed corresponding to the read command. When the pull-up signal of the input / A controller for generating a stunt pulse and terminating the pull-up, floating the input / output line during an enable period of the first constant pulse, and sensing and outputting data when the data is transferred to the floating input / output line; And generating a second constant pulse when the pull-up signal of the input / output line reaches the reference voltage in response to the read command, and outputting the read data to the second And a semiconductor device for outputting the constant pulse through the input / output line during an enable period of the constant pulse.

A controller of the present invention includes: a first mode switch that turns on in response to a first switching mode; And a second mode switch that turns on in response to the second switching mode; A first mode switch for controlling the pull-up and pull-up of the input / output line in response to the turn-on of the first mode switch, a first input / output reference voltage for controlling the pull-up and a first reference voltage for controlling the pull- 1 transmission signal or a first pulse signal corresponding to a transition point of a read command to the input / output line, and performs the pull down in response to the read command, and when the pull-down signal of the input / output line reaches the first reference voltage Outputting a constant pulse; floating the input / output line during an enable period of the constant pulse; sensing and outputting the data when the data is transferred to the floating input / output line; Output line and a second input / output reference voltage for controlling the pull-down and a second input / output reference voltage for controlling the pull-up and the pull-down, respectively, in response to the turn-on of the second mode switch, And outputs a second transmission signal transmitted from the outside or a second pulse signal corresponding to a transition timing of the read command to the input / output line, performs the pull-up in response to the read command, And generates the constant pulse when the second reference voltage is reached. The input / output line is floated during an enable period of the constant pulse. When data is transferred to the floating input / output line, the data is sensed and output .

The present invention can realize a semiconductor device having two terminals, and a semiconductor device can share one terminal for data communication and power supply. Therefore, the semiconductor device can perform asynchronous serial communication. That is, the semiconductor device can write and read data using one shared terminal.

The above-described semiconductor device may have a rectifying function for obtaining a power supply voltage from data.

In addition, according to the present invention, a semiconductor device having two terminals can generate a reference clock for asynchronous serial communication, so that data can be written using a reference clock.

Further, the present invention minimizes the energy loss and the size of the internal circuit, so that data information generated inside the semiconductor device can be stably transmitted to an external controller.

In addition, the present invention can transmit data using a pulse of a short interval and the semiconductor device can recover data transmitted using a pulse of a short interval, thereby increasing the efficiency of the rectification function using data, An asynchronous serial communication technology capable of improving errors in the data transfer process can be implemented.

The present invention can determine a read mode and a write mode according to code information included in data.

Further, the present invention can generate a timing for determining a high or low state of data input in an asynchronous serial manner in a write mode using a data transmission time interval.

Therefore, in the present invention, when a code indicating a read mode is included in data, a semiconductor device having two terminals generates a clock signal corresponding to a transmission time interval and generates internal data (An element array including at least one memory element or a sensor element), and can return to the write mode after receiving the data.

The present invention can generate an output of the semiconductor device in synchronization with a reference pulse signal sent from an external controller in a read mode, and can sense the output of the semiconductor device by an external controller.

In addition, the present invention can reduce the size of the output buffer required by the semiconductor device by alternately performing the operation of transmitting data from the data providing unit to the output buffer and the operation of transmitting data to the outside from the output buffer when outputting data from the semiconductor device .

According to the present invention, the selected one of the two terminals of the semiconductor device is shared for data communication and power supply according to the mode, so that the semiconductor device can be utilized variously.

1 is a perspective view showing an embodiment of a semiconductor device of the present invention.
2 is a schematic view illustrating a cross-section and a planar structure of the semiconductor device of FIG.
3 is a block diagram showing an embodiment of the semiconductor device of the present invention.
4 is a view for explaining the operation of a CNT resistor for an embodiment of the semiconductor device of the present invention.
5 is a block diagram illustrating an embodiment of an asynchronous serial communication system of the present invention.
6 is a waveform diagram for explaining a data reception method using a fixed delay;
7 is a block diagram illustrating an oscillator for applying a variable delay;
8 is a detailed circuit diagram illustrating the delay circuit of FIG. 7;
9 is a timing chart for explaining a method for measuring a pulse width of a start bit to make a timing for data recognition.
10 is a timing chart illustrating a method of making a timing for data recognition by varying a pulse width of a low section of a start bit.
11 is a view for explaining the write and read operations between the controller and the semiconductor device;
12 is a circuit diagram for explaining communication between a controller and a semiconductor device during a write operation;
Fig. 13 is a circuit diagram in which an error prevention circuit is applied to the circuit of Fig. 12; Fig.
14 is a circuit diagram for explaining communication between a controller and a semiconductor device at the time of reading.
15 is a waveform diagram exemplifying a protocol for a transmission signal, a read clock, and a mode signal;
16 is a circuit diagram for explaining communication between a controller and a semiconductor device during a write and a read operation;
17 is a circuit diagram for explaining another embodiment of the present invention.
Fig. 18 is a circuit diagram illustrating a configuration in which the polarity of the drive voltage of the input / output line (I / O line) of the controller of the present invention is selectable.
FIG. 19 is a diagram illustrating a configuration for each mode when the polarity of the drive voltage of the input / output line (I / O line) of the controller of the present invention is changed;

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. It is to be understood that the terminology used herein is for the purpose of description and should not be interpreted as limiting the scope of the present invention.

The embodiments described in the present specification and the configurations shown in the drawings are preferred embodiments of the present invention and are not intended to represent all of the technical ideas of the present invention and thus various equivalents and modifications Can be.

The present invention discloses a semiconductor device having two terminals. In the embodiment of the present invention, the semiconductor device may refer to any chip manufactured by a semiconductor technology that can be implemented at a low cost, such as a security chip, a medical disposable sensor, an environmental sensor, and a small precision industrial sensor.

1, a semiconductor device 10 includes a first terminal 12 and a sensing surface 14 formed on a front side for a first power voltage VF, The second terminal 16 for the second power supply voltage VB is formed. The first terminal 12 for the first power source voltage VF may be formed in various patterns such as a metal pattern or a metal pad and the second terminal 16 for the second power source voltage VB And may be formed of a metal plate as an example.

The semiconductor device 10 includes a substrate 18 between a front side where the first terminal 12 and the sensing surface 14 are formed and a back side where the second terminal 16 is formed, Type semiconductor substrate (P-substrate). The substrate 18 is formed with various circuits for the sensing surface 14 and data processing (read and write) by semiconductor technology.

The semiconductor device 10 illustrates that the first terminal 12 and the second terminal 16 are formed on different surfaces of the substrate 18 but may be formed on the same surface of the substrate 18 without limitation, The sensing surface 14 may also be formed on one side of the substrate 18 alone.

When the first terminal 12 and the second terminal 16 are formed on different surfaces of the substrate 18, all the CMOS devices in the semiconductor device are formed with the structure shown in FIG.

Deep N-wells are formed on the substrate 18, and N-wells and P-wells are formed in the deep N-wells. In the N well and the P well, a P + junction for forming a source and a drain and a pattern (P_gate, N_gate) for forming a gate are formed, in which an N + junction is formed. All the CMOS elements in the actual semiconductor device are formed in the N well and the P well formed in the deep N well, and here, one CMOS element is shown for the sake of convenience.

P wells are formed in the region separated from the deep N wells of the substrate 18, and P + junctions connected to input / output (I / O) circuits may be formed in the P wells. Here, since the P-well is for widening the contact surface with the P-type substrate, it has the same characteristics even if it is formed by the P + junction without the P-well.

When the first terminal 12 and the second terminal 16 are formed on different surfaces of the substrate 18, the CMOS device may be formed by a deep N-well structure as described above, A terminal to which the voltage VSS is applied and a terminal to which the data input / output voltage VIO is applied.

2 is a plan view of a metal layer forming a first terminal 12 to which a first power source voltage VF is applied and a second terminal 16 to which a second power source voltage VB is applied on both surfaces of a substrate 18. [ Is formed. A PN diode is formed between the P-type substrate and the deep N-well. The data input / output voltage applied to the substrate 18 is represented by VIO, and the operating voltage applied to the CMOS device is represented by VDD.

In the CMOS device of FIG. 2, when the data input / output voltage VIO is in the positive state, a signal of the second terminal 16 of the back side through the PN junction formed by the substrate 18 and the deep N well is supplied to the internal power supply To the corresponding VDD node, and when the data input / output voltage VIO is in the negative state, the PN junction is blocked.

There is a capacitance between the node of the operating voltage VDD corresponding to the internal power supply and the ground voltage VSS node corresponding to the first terminal, and the rectifying function can be performed by the capacitance.

2, the CMOS device is used for input / output (I / O) of data and corresponds to a first terminal for applying a contact and a ground voltage VSS corresponding to a second terminal for generating an internal power supply voltage VDD .

In the CMOS device implemented as an embodiment of the present invention, a contact for applying a ground voltage VSS forms a first terminal, and a contact for data input / output (I / O) and a rectifier circuit having a PN diode and a capacitor The contacts used as the internal power supply VDD are commonly connected to form the second terminal.

In addition, the CMOS device of the present invention has a two-terminal structure for power supply voltages (VB, VF) like a normal two-terminal device such as a resistor or a diode. Therefore, giving the pull-down signal to the VB terminal to which the contact for input / output is connected and giving the pull-up signal to the VF terminal to which the ground voltage is applied cause the same operation in the viewpoint of the CMOS device. Thus, the CMOS device of the present invention can be implemented in two different ways of applying an external signal to cause the same operation.

The semiconductor device of the present invention, which is made up of the CMOS device according to the above-described configuration, has two terminals, and one of the terminals may have a configuration in which data is shared for communication and power supply.

Further, the semiconductor device of the present invention may have a rectifying function for obtaining a power supply voltage from data.

A semiconductor device having the structure as shown in FIGS. 1 and 2 can be schematically represented as shown in FIG. 3, and the semiconductor device 10 can secure power from data and perform data communication by the configuration of FIG.

FIG. 3 shows a structure in which the voltage regulator using the PMOS transistor M is added in the structure of FIG. 2 to improve the variability of the operating voltage VDD voltage. However, a system that does not require the correct supply voltage can operate even if the operating voltage VDD is directly used without a voltage regulator.

The semiconductor device 10 of FIG. 3 includes an input / output circuit 20, a CMOS circuit 22 implemented as an element array of CMOS elements, capacitors Cp and Cps, a comparator 24 for controlling charging of a power source, And a PMOS transistor M and a rectifier diode D for regulation. However, this diode is formed by a deep N well when the first terminal 12 and the second terminal 16 are formed on different surfaces of the substrate 18. [ The embodiment of FIG. 3 illustrates that data is transferred through the second power supply voltage VB. Here, the second power supply voltage VB indicates a voltage applied to the second terminal 16 shared with the data input / output terminal of the first terminal 12 and the second terminal 16. In the configuration of FIG. 3, when data is input through the second terminal to which the second power supply voltage VB is applied, the semiconductor device 10 can perform charging and data writing.

First, the diode D and the capacitor Cps constitute a rectifying circuit. The PMOS transistor M, the comparator 24, and the capacitor Cp constitute a regulator, and the rectifier circuit and the regulator control charging using data.

The data is rectified by the diode D and the capacitor Cps and then to the capacitor Cp through the PMOS transistor M and the capacitor Cp is charged by the potential of the rectified data. The regulator controls the transfer of data to the capacitor Cp by the PMOS transistor M by the operation of the comparator 24 comparing the charged amount of the capacitor Cp with the preset reference voltage Vint_ref.

In addition to the above configuration, the output of the rectifier circuit made of diode (D) and capacitor (Cps) without a regulator may be used immediately when power of an accurate regulator output is not required.

As described above, the capacitors Cp and Cps are used for power supply and can perform charging using the output of the diode D.

The data transmitted through the second power supply voltage VB is input to the input / output circuit 20. If the semiconductor device 10 is in the read mode, data provided in the input / output circuit 20 may be output through the second terminal for applying the second power supply voltage VB.

The input / output circuit 20 includes a buffer (I / O buffer) for inputting and outputting data, and a detailed description thereof will be given later.

The CMOS circuit 22 performs an operation of reading data to be input and outputting data to be output, and is interfaced with the input / output circuit 20 for writing and reading data.

The CMOS circuit 22 can secure electrical characteristics for the object to be sensed through the sensing surface 14. [ The CMOS circuit 22 may be represented by an element array including at least one of a sensor element and a memory element formed using a CMOS element.

Here, the sensor element and the memory element constitute the minimum sensor unit and the minimum memory unit which use the CMOS element. The sensor element constituting the array can be referred to as a sensor array, and the memory element constitutes the array, , And the device array may be represented by either a sensor array or a memory array.

Figure 4 illustrates one structure of an element array including sensor elements. Carbon nanotubes (CNTs) may be coated on the sensing surface 14 to measure the electrical properties of the objects to be sensed. This will be described with reference to FIG.

Referring to FIG. 4, a case in which 16 electrodes are included in each unit array of the sensing surface 16, and CMOS devices are correspondingly formed on each electrode is illustrated. At this time, if an electrode corresponding to a specific CMOS device is selected by the data, the electrodes corresponding to the remaining CMOS devices are automatically connected to the ground voltage to provide the surrounding CNT resistance. The semiconductor device of the present invention can sense the electrical characteristics of the object to be sensed by the action of the CNT resistor as shown in FIG.

On the other hand, the serial communication system sequentially transmits a plurality of data through one line. Asynchronous serial communication without external clock signal divides the data into n binary data bits and transfers them to the communication line by 1 bit at a time. The receiving side should reconstruct the data by assembling the bits received through the communication line. At this time, a start bit and a stop bit can be used to identify one data range.

The transmitting side transmits the data bit after transmitting the start bit. The data may include seven or eight data bits in one data range.

When a semiconductor device is implemented to have two pins as in the present invention, the transmission side and the reception side need to match the transmission rate (Baud Rate), which is the transmission rate of the data bits. Conventional Universal Asynchronous Receiver & Transmitter (UART) technology is an asynchronous serial communication technology in which high and low values are set to about 0 to 5V.

The present invention realizes a semiconductor device having two terminals, and one terminal of the semiconductor device is shared for data communication and power supply. The shared terminal of the semiconductor device of the present invention is used for inputting and outputting data while securing power.

That is, the data inputted through the shared terminal of the semiconductor device can be used as the power supply voltage by rectification and charging by the capacitance when passing through the PN junction diode or the MOS diode. However, only the high section of the data is used for charging. Therefore, in order to increase the efficiency of the rectifier circuit, the input data needs to be larger in the size of the high section than in the low section.

Therefore, the present invention generates a pulse having a short row interval at a transition point of data in which the external actual data input becomes high in a row or becomes low in a high state while the data input / output signal VIO is held high, Signal VIO and transfers the transmitted pulse signal to the external real data input signal by using a toggle flip-flop in the semiconductor device.

Even if the potential of the data varies according to the change of the data value by such a pulse method, the power supply voltage can be stably maintained by the rectifying function.

The asynchronous serial communication system of the present invention uses a semiconductor device having only two terminals and performs an operation (write operation) for giving commands to a plurality of semiconductor devices by using one controller and outputting (Read operation) for sequentially receiving data to be read out from the memory.

The semiconductor device having two terminals VF and VB of the present invention has a structure in which the ground voltage VSS is fixed to the VF terminal and the pulse data having the short row interval is applied to the VB terminal or the operation voltage VIO is fixed to the VB terminal And pulse data having a short high period of the opposite polarity is applied to the VSS terminal, thereby ultimately causing the same operation.

Therefore, the system of the present invention employs an asynchronous serial communication technique for communicating through one communication line and a pulse transmission technique for efficiently switching data to rectify the data. The system of the present invention employs a technique of identifying and using a transmission time interval in order to identify data temporally changing in a semiconductor device on the reception side.

An embodiment of the asynchronous serial communication system of the present invention employing the above technique is illustrated in Fig.

Referring to FIG. 5, one controller 100 and a plurality of semiconductor devices 10 are illustrated. The controller 100 may be implemented as a chip and mounted on the control module 11. The control module 11 may include a controller 100 and a signal converter 116. The controller 100 may include a signal converter 116, Performs signal conversion for an interface with an external device such as a personal computer (PC).

The two terminals of the semiconductor device 10 are not specifically shown in Fig. 5, but one terminal may be defined as a terminal connected to an input / output line (I / O Line) used as a communication line, May be defined as a terminal connected to a power line for applying a voltage for defining a voltage of an input / output line (I / O line).

The semiconductor device 10 includes an input buffer 30, a pulse signal restoration circuit 32 and a command decoder 34 for receiving data. The semiconductor device 10 includes a FIFO (First In First Out) memory 42 and an output buffer 40 for storing data to be output according to a predetermined protocol.

The semiconductor device 10 includes a circuit (a clock generator 36) for internally clocking a frequency fixed internally to match the external controller 100 with a baud rate and a start bit And a circuit for determining the capture timing of the serial data by measuring the edge of the start bit.

When the semiconductor device 10 includes two-terminal CMOS devices as the sensor array 52, a mode for determining write and read operations must be determined. The sensor array 52 of FIG. 5 corresponds to the device array that corresponds to the CMOS circuit 22 of FIG. 3 and includes sensor elements. For reference, FIG. 5 shows elements for receiving and outputting data, and elements for charging shown in FIG. 3 are not shown.

The semiconductor device 10 is initialized to have the write mode in a default state.

In the write mode for programming the internal operation, the semiconductor device 10 recognizes the pulse signal in the input buffer 30, restores the recognized pulse signal to the actual signal in the pulse signal restoring circuit 32, As data by using the command decoder 34. [

The semiconductor device 10 recognizes the write mode by the command decoder 34 and provides an address to be written by the address providing part 50 in correspondence with the write mode and outputs data corresponding to the address to the sensor array 52 / RTI >

Therefore, the data recognized by the command decoder 34 is written to the sensor array 52 of the address provided by the address providing part 50. [

The pulse signal restoring circuit 32 restores the signal by the clock signal provided by the clock generator 36. The clock generator 36 detects the start bit as will be described later with reference to FIGS. 9 and 10 It is possible to provide a clock signal of a fixed frequency.

The semiconductor device 10 starts the read operation in response to one of the command codes, i.e., the Read Mode Code.

The semiconductor device 10 outputs data of a designated address of the sensor array 52 when a read mode code and a clock signal are input from the controller 100. [

At this time, the command decoder 34 recognizes the read mode code restored in the pulse signal restoring circuit 32 and provides the read command word, and the address providing unit 50 provides the address to be read in response to the read mode.

The clock signal of the clock generator 36 is used to sequentially synchronize the plurality of data of the address provided by the address providing part 50. The semiconductor device 10 automatically outputs the data of the predetermined length in advance Return to the light mode and wait for the next command input.

When a plurality of semiconductor devices 10 are configured to share one input / output line (I / O line), the lead mode code can include a unique code allocated to each semiconductor device 10. In this case, only the semiconductor device 10 corresponding to the inherent code for classifying the semiconductor device 10 can perform the read operation.

The analog signal output from the sensor array 52 in the semiconductor device 10 is converted into a digital signal through the analog-digital converter 54 and the digital signal is output via the decipher memory 42 Output line (I / O line) through the buffer 40. [

The controller 100 receives data transmitted via an input / output line (I / O line) by a predetermined protocol.

The semiconductor device 10 uses the pompho memory 42 to output the data with a size defined by the promised protocol. The decipher memory 42 repeats the operation of sequentially storing and outputting data of a predetermined size until the mode data is outputted.

The controller 100 generates a signal to be transmitted through one input / output line (I / O line) in accordance with a protocol that the semiconductor device 10 having two pins can receive, and the semiconductor device 10 having two terminals And receives a signal transmitted through one input / output line (I / O line) by a predetermined protocol. The controller 100 is interfaced with the signal converter 116 to receive the transmission signal Tx, the clock signal CLK and transmit the reception signal Rx.

To this end, the controller 100 includes a voltage regulator 102 for generating a stable voltage required for operation of the semiconductor device 10 having two terminals, a command decoder (not shown) for receiving the transmission signal Tx, It is necessary to include a Baud Rate generator 106 for generating a capture timing of data provided by the semiconductor device 10 having the two pins 104 and the two pins.

The controller 100 includes a pulse signal generator 108 for outputting a signal to one input / output line (I / O line), an input buffer 110 for outputting a voltage to the outside and receiving an error- And an output buffer 112 are required.

The signal input from the semiconductor device 10 to the controller 100 is a relatively low level signal.

Therefore, the controller 100 requires a sensor having an amplifier to receive a low-level signal, and before transmitting the sensor-sensed signal to an external device such as a personal computer (PC) A logic circuit is needed to add a start bit or a stop bit to match the UART.

The controller 100 includes a converter 114 for transferring data to an external device such as a personal computer (PC), which converts the sensing signal to a sensor having the amplifier and a transmission protocol And may include the logic circuit described above.

5, the controller 100 includes a voltage regulator 102 that generates and provides a stable voltage required for operation of the semiconductor device 10 having two terminals, A command decoder 104 for providing data, a Baud Rate generator 106 for generating a capture timing of data provided in the semiconductor device 10 having two terminals, A pulse signal generator 108 for providing a signal for loading the data of the command decoder 104 to the I / O line in accordance with the capture timing, a signal of the pulse signal generator 108 using the voltage of the voltage regulator 102, An output buffer 112 for outputting a signal input from the semiconductor device 10 via the input / output line I / O line to the semiconductor device 10, And an input buffer 1 0) to transmit to the external device.

The transmission ratio generator 106 and the converter 114 included in the controller 100 may be configured externally as an additional component.

5, an asynchronous serial communication method using two terminals, which is performed in the system according to the present invention, will be described with reference to the drawings.

FIG. 6 is a representation of a data stream for explaining a sequential data receiving method by UART communication.

The data is actually 7 bits or 8 bits. However, FIG. 6 illustrates the addition of a start bit and a stop bit before and after data for asynchronous serial communication.

The data maintains a high level in the standby state.

If a delay circuit having a fixed delay value is used, the data will be 1.5, 2.5 (for example) based on the start timing of the start bit, which transitions from a high level to a low level. , &Lt; / RTI > and the like.

Here, the delay value can be applied to the timing of recognizing the data, and the delay value D of 1 corresponds to one cycle of the start bit. Therefore, the timing for recognizing the data when the delay value is 1.5 corresponds to the one-half cycle of the start bit from the start timing of the start bit, and the timing for recognizing the data when the delay value is 2.5 is the start of the start bit Corresponds to two cycles of the start bit from the timing.

However, in the case of being configured to recognize data using a delay circuit, there is a problem that the transmitting chip must know the fixed delay value of the receiving chip and the baud rate corresponding to the delay value must be set in the transmitting chip have. The delay value of the delay circuit can be varied according to conditions such as a process condition for manufacturing a chip and a temperature environment. Therefore, there is a problem in recognizing the data transmitted by the asynchronous serial communication method using the delay circuit.

The embodiment of the present invention includes a circuit for measuring the Low section in which the semiconductor device 10 keeps the enable bit of the signal transmitted from the controller 100 in order to overcome the above problems A method for generating a variable baud delay using the circuit, and a method for sequentially recognizing data using a transmission delay (Baud Delay).

The ring oscillator of FIG. 7 can recognize data by using a ring oscillator as shown in FIG. 7. The ring oscillator of FIG. 7 includes a time point where the start bit becomes Low and a period that returns to High Can be measured. The ring oscillator can be configured in the clock generator 36.

The ring oscillator includes a plurality of delay circuits (DUC) 70 and a NOR gate 72, and each delay circuit 70 includes a latch 74 as shown in FIG. Wherein the plurality of delay circuits 70 form a chain connected in series and the NOR gate 72 includes a plurality of delay lines serially connected with an enable signal EN transitioning from high to low at the start of the start bit, Is configured to receive the delayed signal returned from the circuit (70) and provide an output to the first delay circuit (70). The enable signal EN is transitioned from high to low and then maintained at the low level. The delay signal means a signal transmitted between the delay circuits 70. The delay signal returned to the Noah gate 72 maintains the low state initially and is converted to high at the time when the start bit transits high .

The ring oscillator includes several delay circuits 70 connected in series and maintains or halts the delay of the delay signal transferred between the delay circuits 70 by the output of the latch 74 to measure the low section of the start bit . The ring oscillator is configured such that a delay signal is returned from the delay circuit 70 to the NOR gate 72 at a time point when the transmission of the delay signal between the delay circuits 70 is stopped due to the termination of the start bit.

The configuration of each delay circuit 70 will be described with reference to Fig.

The delay circuit 70 includes a forward line for advancing the delay signal in the forward direction and a backward line for advancing the delay signal in the backward direction.

The delay circuit 70 includes a pass switch ST for selectively connecting the forward line and the back word line, a progress switch SF configured on the forward line for advancing the delay signal in the forward direction, And a progress switch SB configured on the back word line to advance the signal.

The delay circuit 70 includes a delay line 70 configured to delay the delay signal on the forward line and the delay circuit 70 includes a delay circuit 70, And a precharge switch SC for precharging the forward line between the precharge switch SC and the precharge switch SC. The precharge switch SC may be operated to precharge the forward line when the advance switch SF is turned off.

The pass switch ST and the advance switches SF and SB may be composed of a transmission gate in which an NMOS transistor and a PMOS transistor are coupled in parallel. In the pass switch ST, the reverse output QB of the latch 74 is applied to the gate of the NMOS transistor, and the positive output Q of the latch 74 is applied to the gate of the PMOS transistor. In the progress switches SF and SB, the positive output Q of the latch 74 is applied to the gate of the NMOS transistor and the inverted output QB of the latch 74 is applied to the gate of the PMOS transistor. Also, the precharge switch SC may be comprised of an NMOS transistor, and the reverse output (QB) of the latch 74 is applied to its gate.

And the delay circuit 70 includes a latch 74 that provides a switching signal that determines the switching state of each of the switches SF, SB, SC. The latch 74 may be configured as an SR flip-flop.

The delay circuit 70 includes an AND gate 75 to which a delay signal transmitted via a forward line and a signal in which a start bit is inverted (/ START, hereinafter referred to as a reverse start bit) And an output is provided to the latch 74 as a set signal SET.

The latch 74 determines the state of the constant output Q and the reverse output QB by the state of the set signal SET and the reset signal RESET.

The positive output (Q) and inverted output (QB) of the latch 74 correspond to the switching signal. The latch 74 outputs the constant Q (Q) to the low level and the inverted output (QB) to the high level when the reset signal RESET is enabled to the high level or the set signal SET is disabled to the low level do. The latch 74 outputs the positive output Q to the high level and the inverted output QB when the set signal SET is enabled to the high level while the reset signal RESET is disabled to the low level, To a low level.

In the initial state, the delay circuit 70 is reset, and the reset of the delay circuit 70 opens the pass switch ST and the progress switches SF, SB are closed.

When the start bit starts and the reverse start bit transitions from low to high, the enable signal EN also transitions from high to low. At this time, the reset signal RESET is set to disable.

When the enable signal EN transitions to the low level, the NOR gate 72 outputs the high-level delay signal to the first delay circuit 70 since all the inputs are set to the low level.

As described above, when the start bit is started and the reset of the delay circuit 70 is released, the latch 74 of each delay circuit 70 is sequentially set by the delay signal sequentially transmitted, Q) to a high level. By the set state of the latch 74, the passage switch ST is closed and the advance switches SF and SB are opened.

The delay signal is advanced in the forward direction during the enable period in which the reverse start bit is held high by the sequential operation of the delay circuit 70. The delay signal is delayed from the delay circuit 70 until the start bit is transitioned from low to high, (70).

The latch 74 of the delay circuit 70 corresponding to the time at which the start bit transitions from the low level to the high level, that is, the time at which the reverse start bit transitions from the high level to the low level, And outputs the output Q at a low level.

That is, the passing switch ST of the delay circuit 70 corresponding to the time point at which the start bit ends is opened and the progressive switches SF and SB are closed. Therefore, the delay signal can no longer proceed in the forward direction, but is transmitted through the back switch line ST to the back word line through the pass switch ST and is returned through the back word line.

In the ring oscillator, the delay signal propagates in the forward direction through the forward lines of several delay circuits 70 overlapped from the start point to the end point of the start bit, The delay signal is returned to the NOR gate 72 through the word line.

It can be assumed that the path where the delay signal is returned is ideally not applied to the delay time. The delay time of the delay line 70 from the low level to the high level of the delay line and the delay time of the transition from the high level to the low level ), The ring oscillator can generate an oscillation signal having a period corresponding to twice the pulse width of the start bit.

However, the path on which the delayed signal is returned actually has a delay time. Therefore, for the accurate period setting of the oscillation signal, it is necessary to compensate for the increase of the period of the actual oscillation signal due to the delay of the pass switch ST and the fine delay of the back word line. For this, the delay line may be configured to have a delay time of the polling time point more than the delay time of the rising time point.

That is, the delay line of the delay circuit is delayed by a high to low (" low ") delay for the delay signal to compensate for the delay of the pass switch ST and the delay through the back word line. ) Delay can be configured to be shorter.

As described above, it is necessary to adjust the clock duty so that the delay resulting from the delay of the forward line and the back word line becomes a delay that determines the period of one actual oscillation signal.

The delay line may be designed to include two or more stages of a driving circuit of a CMOS transistor structure in which a PMOS transistor and an NMOS transistor are combined. If necessary, a capacitor may be additionally provided at an output terminal of each driving circuit.

The period of the oscillation signal is determined by the number of stages of the driving circuit and the resistance values present in each stage. Therefore, the period of the oscillation signal can be adjusted by varying the resistance value to adjust. Alternatively, the period of the oscillation signal can be determined by adjusting the gate bias voltage applied to each stage when the NMOS transistor or the PMOS transistor is used as a resistor. Therefore, the adjustment of the clock duty can also be performed by adjusting the resistance value.

9 and 10 are waveform diagrams for explaining a method for measuring a pulse width of a start bit and generating a capture signal for data recognition without an external clock signal. Here, the pulse width measurement of the start bit may be performed in the clock generator 36, and the generation of the capture signal and a detection signal to be described later may be performed in the pulse signal restoration circuit 32.

The period of the oscillation signal generated by the start bit in FIG. 9 is twice the transmission bit size of the start bit as described with reference to FIGS. Therefore, in order to generate the timing for data recognition, there is a need for a detection circuit that detects transition points that transition from high to low or low to high of the oscillation signal, and generates a detection pulse that is synchronized with the detected points. Then, a delay circuit for delaying the detection pulse so that the detection pulse is positioned in the middle of the section in which the data is transmitted is required. The detection circuit and the delay circuit described above can be configured in the pulse signal restoration circuit 32. [

When the controller 100 is configured to generate a capture signal by the signal processing process as shown in FIG. 9, the controller 100 can use an externally transmitted signal protocol as it is, so that there is an advantage that it is unnecessary to modify the signal.

However, in the case of generating a capture signal as shown in FIG. 9, since the first data (DATA0) following the start bit of the controller 100 must always be in a high state, only 7 bits can be effectively used in the case of 8- A delay circuit for delaying the detection signal must be applied so that it can have the timing for the detection signal. There is a need to adjust the clock duty so as to compensate the delay of the pass switch ST and the delay time of the back word line in the delay circuit 70 constituted in the ring oscillator so that a difference may occur in the even and odd timing have.

Alternatively, the embodiment of the present invention can configure the controller 100 to send the start bit section sent to the semiconductor device 10 in half, as shown in FIG. For the embodiment of FIG. 10, the controller 100 requires a circuit for halving the start bit period of the externally received signal.

In this case, the period of the oscillation signal generated by the oscillator becomes equal to the transmission bit size of the start bit. When the oscillation signal is generated as shown in FIG. 10, the timing for data recognition can be ensured without having to construct a delay circuit, and no timing difference due to the clock duty occurs.

In the case of generating the oscillation signal as shown in Fig. 10, the controller 100 needs to apply a delay circuit for delaying the detection signal so as to detect the transition or to have timing for recognizing the data as compared with the case of Fig. 9 none.

However, in order to generate the oscillation signal as shown in FIG. 10, the controller 100 requires a separate signal processing process for adjusting the start bit. In the process of measuring the start bit of the short interval, A rounding off error may occur in the oscillator.

The present invention may select the controller 100 to perform the signal processing process of FIG. 9 or 10 to determine the timing of capturing data according to the convenience of the manufacturer.

On the other hand, the embodiment of the present invention discloses a method for enabling operation of the semiconductor device 10 with two terminals by effectively sharing data and power.

The semiconductor device 10 having two terminals can be configured to share a power source with a data line using a rectifying circuit having a diode and a capacitor as shown in Fig.

11 illustrates that the controller 100 and the semiconductor device 10 transmit data by a tri-state input / output method. Particularly, FIG. 11A is a circuit diagram showing that data is written in the semiconductor device 10 in the controller 100, and FIG. 11B is a circuit diagram in which data is sent from the semiconductor device 10 to the controller 100 It is a circuit diagram expressing that it leads.

When the controller 100 writes data to the semiconductor device 10 as shown in FIG. 11A, the output buffer 112 of the controller 100 is always in the ON state and the output buffer 112 of the semiconductor device 10 40 are always off.

The signal output from the controller 100 is transmitted to the input buffer 30 of the semiconductor device 10 and at the same time a high level signal is provided through the diode D as a power source for providing the operating voltage VDD. The operating voltage VDD can be provided by charging the capacitor Cp with the voltage of the high level section of the signal output from the controller 100. [

11 (b), synchronous tri-state input / output control between the controller 100 and the semiconductor device 10 is required when data is read from the semiconductor device 10 to the controller 100. [ That is, the output buffer 112 of the controller 100 must be off while the output buffer 40 is turned on in the semiconductor device 10. In order to control input and output between the controller 100 and the semiconductor device 10, the controller 100 sends a reference signal for synchronization, and the input and output timings of the controller 100 and the semiconductor device 10 Can be synchronized.

However, when data is written to the semiconductor device 10 from the controller 100, if the data is held low or the low section is lengthened by the low-frequency operation, the amount of charge charged in the capacitor Cp of the semiconductor device 10 It may be insufficient to maintain the voltage VDD.

When data is read from the semiconductor device 10 to the controller 100, the signal output from the semiconductor device 10 is due to the amount of charge charged in the capacitor Cp. Therefore, when controlling the tristate input / output, The capability of driving data from the semiconductor device 10 to the controller 100 may be lowered when the load on the input / output line (I / O line) is large. That is, it may be difficult to transfer data from the semiconductor device 10 to the controller 100. [

In order to read data from the semiconductor device 10 to the controller 100, the controller 100 transmits a reference signal to the semiconductor device 10 for synchronization, If the time required for receiving the reference signal from the semiconductor device 10 and sending the data is longer after the output buffer 112 of the semiconductor device 100 is turned off, the section in which the semiconductor device 10 is not supplied with power is increased, It may be difficult to maintain the voltage VDD.

SUMMARY OF THE INVENTION In order to solve the problem described above, the present invention provides a pulse signal generator that generates a pulse signal having a small width and a low level at a time point when a potential of an input / output line (I / O line) And the controller 100 and the semiconductor device 10 are controlled so as to have a protocol for stably maintaining the operating voltage VDD and recovering a pulse signal having a small width and a low level displacement, Lt; / RTI >

Also, the present invention can be configured to simultaneously measure the voltage level of the pulse signal in the controller 100 and the semiconductor device 10 in the case of a read requiring synchronization, thereby reducing the time delay due to synchronization.

The above-described configurations can be implemented by the embodiments described below.

12 illustrates a circuit diagram for explaining writing data into the semiconductor device 10 having two pins from the controller 100 and waveforms related thereto.

12, the controller 100 and the semiconductor device 10 are configured to communicate with each other through an input / output line (I / O line).

The controller 100 maintains the pull-up so that the input / output line I / O line maintains the input / output reference voltage IOref or more. When the transmission signal Tx is input, The pull-down is stopped when the voltage (pull-down signal) of the input / output line (I / O line) reaches the preset reference voltage Vref, Line voltage is restored by pull-up and is configured to output a pulse signal swinging by pull-up and pull-down in accordance with the transmission signal Tx to the input / output line (I / O line).

More specifically, the controller 100 includes a pulse generating unit 120, an input / output voltage regulator 126, and a pull-down control unit. When a transmission signal Tx is input, the pulse generating unit 120 generates a pulse signal Output voltage regulator 126 is configured to perform a pull-up for maintaining the input / output line I / O line at least equal to the input / output reference voltage IOref, and the pull- O line and the pull-down is performed when the voltage (pull-down signal) of the input / output line (I / O line) reaches a preset reference voltage Vref .

The voltage level of the input / output line (I / O line) after the pull-down stop is returned by pull-up, and a pulse signal swinging by pull-up and pull-down corresponding to the transmission signal Tx is outputted to the input / output line (I / O Line) .

Here, the pull-down control unit includes a transistor Mn for pulling down the input / output line I / O line, a gate for turning on the transistor Mn when a high level signal is input from the pulse generating unit 130, And a comparator 124 for controlling the AND gate 122 to stop the pull-down when the voltage of the input / output line I / O line reaches a preset reference voltage Vref due to the pull-down.

Then, the semiconductor device 100 performs a charge and write mode using a pulse signal.

The semiconductor device 100 includes an input buffer 30 for comparing a pulse signal with a preset comparison voltage for providing a signal corresponding to the difference between the pulse signal and the comparison voltage, A pulse generating circuit 130 for outputting a pulse having a synchronous transition point and a toggle flip flop 134 for recovering data having the same phase as the transmission signal Tx using the pulses of the pulse generating circuit 130 .

The semiconductor device 100 includes a diode D having a first and a second pin and receiving a signal including a pulse signal through an input / output line (I / O Line) connected to one pin, And a capacitor Cp that charges the signal transferred by the capacitor D and generates the operating voltage VDDC.

When the transmission signal Tx, which is a UART signal, is input from an external device, the controller 100 detects a transition point (High to Low or Low to High) of the transmission signal Tx and generates a pulse.

Pulse generation corresponding to the transmission signal Tx can be performed by the pulse generation unit 120. The pulse generation unit 120 generates a pulse corresponding to the transmission signal Tx as a result of the exclusive OR combination of the original transmission signal Tx and the transmission signal Tx delayed by a predetermined time, Lt; / RTI >

The pulse generated by the pulse generator 120 is provided to the AND gate 122. When the pulse generator 120 receives a high level signal, the AND gate 122 turns on the NMOS transistor Mn, The input / output line (I / O line) is pulled down by turning on the switching transistor MnQc.

Pull down of the I / O line is maintained until the voltage (I / O) level of the input / output line (I / O line) reaches the reference voltage Vref applied to the comparator 124 .

When the pull-down signal reaches the reference voltage Vref applied to the comparator 124, the pull-down of the input / output line (I / O line) is stopped And the voltage (I / O) of the input / output line (I / O line) is returned to the original high level from the moment the pull down is stopped by the operation of the input / output voltage regulator 126. The input / output voltage regulator 126 performs a regulating operation so that the voltage (I / O) of the input / output line (I / O line) is maintained at a predetermined high input / output reference voltage IOref or more.

The controller 100 repeats the above operation for each transition point of the transmission signal Tx. As a result, the controller 100 can output a triangular pulse signal that swings between the reference voltages IOref and Vref levels, corresponding to the transmission signal Tx. Here, the level of the reference voltage Vref can be determined between the input / output reference voltage IOref and the ground voltage level, and a pre-designed value can be selected according to the intention of the manufacturer.

On the other hand, the semiconductor device 10 having two pins receives a signal including a triangular pulse signal through an input / output line (I / O line) and operates by rectifying action of the diode D and the capacitor Cp Thereby generating the voltage VDD. At this time, the signal of the input / output line (I / O line) always maintains a high level except for a short interval in which the triangular wave exists. Therefore, the semiconductor device 10 can stably maintain the operating voltage VDD, and can generate a good quality operating voltage VDD in which the glitch noise is filtered according to the capacity of the capacitor.

Further, a signal transmitted to the semiconductor device 10 through the input / output line (I / O line) is provided to the input buffer 30 of the comparator type.

The input buffer 30 compares the signal of the input / output line (I / O Line) with the comparison voltage (reference voltage of the level capable of recognizing the operation voltage VDD or the pulse of the triangular wave type) And provides the pulse generating circuit 130 with a signal corresponding to the difference between the signal and the comparison voltage.

The pulse generating circuit 130 provides the AND gate 132 with a pulse having a synchronized transition point corresponding to the output of the input buffer 30. [

The AND gate 132 transfers the pulse of the pulse generating circuit 130 to the toggle flip-flop 134 when in the write mode and the toggle flip-flop 134 outputs the same phase as the transmission signal Tx sent to the controller 110 Data can be restored.

12, when an unintended glitch signal is generated on the communication path, the data output from the toggle flip-flop 134 can be inverted.

In order to prevent the above error, the present invention can be implemented as shown in FIG. Referring to FIG. 13, the embodiment of the present invention resets the toggle flip-flop 134 automatically when there is no pulse input for a period of power-up when the initial power is turned on and a period of a predetermined maximum number of bits Thereby preventing a communication error caused by the glitch signal. Here, the predetermined maximum number of bits can be exemplified as 9, which is the maximum communication bit number of the UART communication.

13 for the above-mentioned error prevention operation includes a clock counter 136 and an AND gate 138, and the clock counter 36 and the AND gate 138 can be represented by an error prevention circuit.

The clock counter 136 performs a count operation using a clock signal generated internally, counts a preset maximum number of bits, and is reset when there is a pulse input (Data_Pulse) output from the AND gate 132 during counting, When the count for the set maximum number of bits is completed, a signal of a high level corresponding to the result is supplied to the AND gate 138.

The AND gate 138 resets the toggle flip-flop 134 when the clock counter 136 counts the maximum number of bits already set in the power-up state.

On the other hand, Fig. 14 is a diagram illustrating a circuit for explaining an operation of reading data from the semiconductor device 10 having two pins in the controller 100 and waveforms related thereto. Figure 14 shows an embodiment that further includes a circuit for the lead, as opposed to the embodiment of Figures 12 and 13.

14, the pulse generating circuits 130 and 140 shown in the controller 100 and the semiconductor device 10 can be implemented with a constant pulse generator and can generate pulses having a constant width, It is possible to prevent one input from being recognized as two or more inputs due to noise (Glitch Noise).

The operation of the embodiment corresponding to the data read will be described with reference to Fig.

The controller 100 and the semiconductor device 10 perform the read operation and the controller 100 activates the read clocks Rclk for a predetermined number of times.

The input / output line (I / O line) can be pulled down at the time when the read clock Rclk changes to the high level in the controller 100. The pull-down of the input / output line may be controlled according to the output state of the comparator 124. When the voltage I / O of the input / output line I / O reaches the reference voltage Vref, The output state of the I / O line 124 is changed, so that the pull-down of the input / output line (I / O line) is stopped.

At the same time, the pulse generating circuit 140 receiving the output of the comparator 124 generates a pulse having a constant width. A pulse of a predetermined width outputted from the pulse generating circuit 140 turns off the PMOS transistor M2. The turn-off of the PMOS transistor M2 means that the voltage regulator 126 and the input / output line (I / O line) are separated. As a result, the input / output line (I / O line) becomes a floating state in which only the termination resistance R exists.

When the semiconductor device 10 outputs data to the input / output line (I / O line) while the input / output line is floating as described above, the voltage of the input / output line (I / O line) . The voltage change of the input / output line may be sensed by the double sampling differential amplifier 150 of the controller 100 and the pulse supplied from the pulse generating circuit 140 may be The double-sampling differential amplifier 150 latches the sensed signal.

The double sampling differential amplifier 150 amplifies the voltages at the start and the end of the pulse provided by the pulse generating circuit 140 by positive switching operations of the switches SW1 and SW2 in positive positive and negative (-) capacitors, respectively. Then, the double sampling differential amplifier 150 outputs the difference between the voltages sampled twice as the read data Dout.

It is preferable that the termination resistance R be calibrated to a value suitable for sensing the data output from the semiconductor device 10. It is preferable that the termination resistance R be calibrated to a value suitable for sensing data output from the semiconductor device 10, Noise influx can be reduced. That is, the resistance value of the termination resistance R is reduced when the sampling difference value of the controller 100 is shifted toward the high side, and is increased when the shift value is shifted toward the low side, so that the sampling value of the high and low is balanced.

On the other hand, when the input / output line I / O line is pulled down and floated at the time when the read clock Rclk changes to the high level in the controller 100, the semiconductor device 10 outputs the changed output of the input buffer 30 The pulse generating circuit 130 outputs a pulse having a constant width.

At this time, the input buffer 30 may be configured to determine the output using the same reference voltage Vref as applied to the comparator 124 of the controller 100. [ The pulse generating circuit 130 outputs a pulse which maintains a high level for a predetermined time based on a time point when the output level of the input / output buffer 30 changes from high to low.

The input / output switch (I / O switch) is turned on while the pulse of the pulse generating circuit 130 is maintained at the high level in the state where the read mode is activated by the output of the AND gate 133. That is, data output through the output buffer 40 during this period can be transmitted to the controller 100. [

The flip-flop 43 constituted at the last stage of the decipher memory 42 is shifted in synchronization with the timing at which the pulse of the pulse generating circuit 130 transitions to the low level. By shifting the flip- The data output from the final stage of the data driver 42 is transferred to the controller 100 via the output buffer 40 and the input / output switch (I / O switch).

The pulse generating circuits 130 and 140 constituted in the controller 100 and the semiconductor device 10 in the above description include the delay unit 142, the AND gate 144, the SR flip flop 146 and the constant delay unit and a constant delay 148.

The delay unit 142 delays the input signal by a preset value. The AND gate 144 combines a signal obtained by inverting the input of the pulse generating circuits 130 and 140 and an output of the delay section 142 to generate a pulse. The SR flip-flop 146 receives the pulse of the AND gate 144 as a set signal, receives the signal of the constant delay unit 148 as a reset signal, is triggered by the set signal, and is delayed by the constant delay unit 148 And outputs a pulse whose time is determined. The constant delay unit 148 provides a signal for resetting the SR flip-flop 146 in response to a change in the output of the SR flip-flop 146 and controls the SR flip- do.

In the above configuration, the delay unit 142 preferably has a delay set to a minimum value so that a pulse having the minimum recognizable pulse width at the SR flip-flop 146 can be output from the AND gate 144.

As described above, the semiconductor device 10 generates a pulse having a predetermined width in the pulse generating circuit 130 like the controller 100 at the moment when the input / output line (I / O line) becomes the reference voltage Vref O switch during the high period of the pulse output from the pulse generating circuit 130 to output the output data stored in the decipher memory 42 to the input / output line (I / O line).

Here, the semiconductor device 10 and the controller 100 generate a pulse having a constant width by using the same reference voltage Vref. Therefore, if the delay on the input / output line (I / O line) is neglected, it has the effect of generating a pulse having a substantially constant width at substantially the same time. This means that synchronization for tri-state input / output control is implemented. Therefore, the embodiment of the present invention has an advantage that an additional delay for synchronization can be prevented and the transmission speed of data can be increased.

In addition, since the embodiment of the present invention transmits a pulse having a small swing width and a short time through an input / output line (I / O), it is advantageous in terms of power consumption.

Here, the pulse generating circuits 130 and 140 can prevent the pulse signal from being generated twice or more for one level transition due to the glitch phenomenon using the minimum delay in the delay unit 142 . It is preferable that the pulses outputted from the controller 100 and the pulse generating circuits 130 and 140 of the semiconductor device 10 have the same width. If the delay of the input / output line (I / O line) has to be considered, it may be considered to increase the pulse width of the pulse generating circuit 140 of the controller 100.

The embodiment of the present invention can use the transmission signal TX, the read clock Rclk and the mode signal W / R having the protocol as shown in Fig. 15 to perform the read and the mode.

Referring to FIG. 15, the transmission signal Tx may include data to be written to the semiconductor device 10, a lead command code for controlling the read mode, and a code for distinguishing the semiconductor device 10 from each other.

The mode signal W / R may have a waveform that maintains a high level by default in the write mode, changes to the low level in the read mode, and returns to the write mode after the read mode ends.

The read clock Rclk is formed alternately with a period for performing periodic sensing and data conversion corresponding to the read mode. According to the present invention, when data is output from the semiconductor device, You can reduce the size of the required output buffer by outputting it immediately. In addition, it is possible to prevent input / output noise from being introduced into the noise sensing sensing and data conversion sections.

Figure 16 illustrates an integrated circuit diagram for performing write and read operations in accordance with the present invention. FIG. 16 is an illustration in which FIG. 12 and FIG. 14 are integrated, and there is a difference in that a transfer signal Tx in FIG. 12 and an OR gate 121 for transferring the read clock Rclk in FIG. 14 are further added.

Therefore, the output of the AND gate 122 is changed corresponding to the pulse corresponding to the read clock Rclk or the transmission signal Tx transmitted through the OR gate 121. [

The semiconductor device 10 having two terminals can provide different operating modes depending on the voltage characteristics. This relates to the architectural form of a two-terminal CMOS device and how to determine the voltage. That is, the voltage applied to the two-terminal CMOS device is determined by the potential difference between the two terminals. Therefore, when the VF terminal of the two terminals is fixed to the ground voltage VSS and a pull-down pulse is applied to the VB terminal, or when the VB terminal is fixed to the external power supply by setting the input / output in reverse and the pull-up signal is applied to the VF terminal, The same operation is performed.

The embodiment of FIG. 17 exemplifies that the level of the input / output line (I / O Line) of the controller 100 is reversed. That is, assuming that the external power source of the controller 10 is 5 V, the operation period is defined as "5 V-input / output reference voltage IOref", and the level of the input / IOref) "

When the transfer signal Tx or the read clock Rclk, which is a UART signal, is input from the external device to the controller 100, the NAND gate 122a is connected to the read clock Rclk or the pulse corresponding to the transfer signal Tx transmitted through the OR gate 121a, Is changed.

More specifically, the controller 100 detects a level transition (High to Low, Low to High) of the transmission signal Tx or the read clock Rclk using the NAND gate 122a. The NAND gate 122a generates a pulse for pulling up the input / output line (I / O Line) corresponding to the transition point of the transfer signal Tx or the read clock Rclk, and the PMOS transistor Mp is connected to the NAND gate 122a And performs an operation for pulling up the input / output line (I / O Line) corresponding to the output.

When the voltage (pull-up signal) of the input / output line (I / O line) rises above "5V-Vref" due to the above pull-up, the output of the comparator 124a changes from high level to low level, Up operation is stopped by the output of the AND gate 122a. A voltage regulator 126a is formed in the input / output line (I / O line). The voltage regulator 126a sets the voltage level of the input / output line I / O line to "5V-input / output reference voltage IOref ) &Quot;. Therefore, the controller 100 of Fig. 17 outputs "5V-IOref" to "5V-IOref" through the input / output line (I / O line) corresponding to the transmission signal (Tx) Quot; Vref ".

17, the input / output line I / O line is connected to a terminal to which a VF voltage (represented by VSS in FIG. 17) of two terminals of the semiconductor element 10 is applied, and a fixed voltage of 5 V is input / To another terminal of the semiconductor device 10 connected to the I / O line.

Although the controller 100 of FIG. 17 is different from the circuit of FIG. 16, the write and read operations can be understood by the description of the previous embodiments, and thus duplicated description will be omitted. Since the signal of the I / O line at the time of reading is inverted in the controller 100 of Fig. 17 as compared with Fig. 16, the data transmitted from the semiconductor device 10 needs to be inverted and processed.

17, the semiconductor device 10 has the same configuration and function as those of the previous embodiments except that the level of the input / output line (I / O line) is reversed. Therefore, The description is omitted.

The embodiment of FIG. 18 is a combination of the embodiment of FIG. 16 and the controller 100 of FIG. 17 in one embodiment. The embodiment of Fig. 18 requires a configuration of a mode selection switch (Mode-1, Mode-2) capable of selecting the mode of Fig. 16 and the mode of Fig.

Here, the mode of FIG. 16 can be defined as a normal mode, and the mode of FIG. 17 can be defined as a reverse mode.

18 exemplarily shows only the read clock Rclk, and only the circuit related to the pull-up and pull-down of the input / output line (I / O Line) is briefly illustrated. The embodiment of FIG. 18 includes a mode selection switch (Mode-1, Mode-2) for mode switching. In FIG. 18, the description of the reference numerals for the constituent elements shown in FIG. 16 and FIG. 17, and the description of the constitution and operation thereof are omitted.

18, the controller 100 performs the normal mode when the mode selection switch (Mode-1) is turned on, and the controller 100 performs the reverse mode when the mode selection switch (Mode-2) is turned on.

18, when the controller 100 is configured as shown in FIG. 18, the controller 100 determines that the first power supply voltage VF of the front side and the data are connected to one terminal The semiconductor device 10 corresponding to the shared semiconductor device 10 or the semiconductor device 10 in which the second power supply voltage VB on the back side and the data share one terminal as shown in FIG. . Therefore, the controller 100 of Fig. 18 can measure various semiconductor devices 10 while changing modes.

19 shows a case in which the semiconductor device 10 has a plurality of electrodes (sensor electrodes) on its surface and one ring-shaped terminal in the periphery thereof and another terminal on the rear surface.

As shown in Fig. 19A, in the normal mode corresponding to Fig. 16, a narrow pulse having an amplitude at which the voltage level is lowered corresponding to the data of the write or read is generated in the input / output line (I / O line). In the reverse mode corresponding to Fig. 17, as shown in Fig. 19B, a narrow pulse having an amplitude such that the voltage level increases corresponding to the data of the write or read is generated in the input / output line (I / O line).

The controller 100 senses the change of the input / output line (I / O line) at the time of reading by the double sampling differential amplifiers 150 and 150a and recognizes the data as data. The start bit and the stop bit Bit) to generate the reception signal Rx.

With the above-described configuration, the present invention can implement a semiconductor device having two terminals using a CMOS device having two terminals, and the semiconductor device can share one terminal for data communication and power supply. Therefore, the semiconductor device can perform asynchronous serial communication. That is, the semiconductor device can write and read data using one shared terminal.

Therefore, in the present invention, when a code indicating a read mode is included in data, a semiconductor device having two terminals generates a clock signal corresponding to a transmission time interval and generates internal data (An element array including at least one of a sensor element and a memory element formed by using a CMOS element), and return to the write mode after receiving the data.

In the present invention, in the read mode, the output of the internal data forming section is generated in synchronization with the reference pulse signal sent from the external controller, the output is stored in one input / output terminal and sensed by an external controller Can be distinguished.

In the present invention, when data is output from the internal data forming unit, the operation of transferring data from the CMOS circuit to the output buffer and the operation of transferring data from the output buffer to the outside are alternately performed, .

Claims

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The pull-down control unit controls the pull-up and pull-down of the input / output line, performs the pull-down in response to a read command, and when the pull-down signal reaches a predetermined reference voltage, A controller for floating the input / output line during an enable period of the pulse and for sensing and outputting data when the data is transferred to the input / output line being floated; And
And a semiconductor device which generates a second constant pulse when the pull-down signal of the input / output line reaches the reference voltage and outputs the read data through the input / output line during an enable period of the second constant pulse ,
The controller comprising:
An input / output voltage regulator maintaining the pull-up so that the input / output line maintains an input / output reference voltage or higher;
A pull-down control unit for performing the pull-down on the input / output line in response to a read command, the pull-down control unit terminating when the voltage of the input / output line reaches a preset reference voltage;
A pulse generating circuit for generating the first constant pulse having the enable period of a predetermined width when the pull-down signal of the input / output line reaches a predetermined reference voltage; And
And a transistor for disconnecting the connection between the input / output line and the input / output voltage regulator during the enable period of the first constant pulse to float the input / output line.

3. The apparatus of claim 2,
A first switch which is turned on at the time when the enable of the first constant pulse starts to sample the data of the input / output line;
A second switch that is turned on at a time when the enable of the first constant pulse ends and samples the data of the input / output line; And
And a double-sampling differential amplifier for outputting the difference of the voltages sampled twice by the first and second switches as the read data.

3. The apparatus of claim 2, wherein the pull-
A transistor for pulling down the input / output line;
And a comparator for comparing a voltage of the input / output line with a predetermined reference voltage,
The pull-down is performed by turning on the transistor corresponding to the read command,
And controls the transistor to terminate the pull-down if it is determined by the comparator that the voltage of the input / output line has reached the predetermined reference voltage by the pull-down.

The pull-down control unit controls the pull-up and pull-down of the input / output line, performs the pull-down in response to a read command, and when the pull-down signal reaches a predetermined reference voltage, A controller for floating the input / output line during an enable period of the pulse and for sensing and outputting data when the data is transferred to the input / output line being floated; And
And a semiconductor device which generates a second constant pulse when the pull-down signal of the input / output line reaches the reference voltage and outputs the read data through the input / output line during an enable period of the second constant pulse ,
The semiconductor device includes:
An input buffer for detecting that the pull-down voltage for the input / output line has reached the reference voltage;
A pulse generating circuit for generating the second constant pulse having the enable section having a constant width when the pull-down voltage for the input / output line reaches the reference voltage;
And outputting the read data through the input / output line during an enable period of the second constant pulse.

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An input / output voltage regulator that maintains the pull-up so that the input / output line maintains an input / output reference voltage or higher;
A pull-down control unit for performing pull-down on the input / output line in response to a read command, and terminating when the voltage of the input / output line reaches a preset reference voltage;
A pulse generating circuit for generating a constant pulse having an enable period of a predetermined width when the pull-down signal of the input / output line reaches a predetermined reference voltage; And
And a first transistor for blocking connection between the input / output line and the input / output voltage regulator during the enable period of the constant pulse to float the input / output line,
And a controller for sensing and outputting the data when the data is transferred to the floating input / output line.

8. The apparatus of claim 7,
A first switch which is turned on at the start of the enable of the constant pulse to sample the data of the input / output line;
A second switch that is turned on at the time when the enable of the constant pulse ends and samples the data of the input / output line; And
And a double sampling differential amplifier for outputting the difference of the voltages sampled twice by the first and second switches as the read data.

8. The apparatus of claim 7, wherein the pull-
A second transistor for pulling down the input / output line; And
And a comparator for comparing a voltage of the input / output line with a predetermined reference voltage,
Turning on the second transistor corresponding to the read command to perform the pull down;
And controls the second transistor to terminate the pull-down if it is determined by the comparator that the voltage of the input / output line has reached the predetermined reference voltage by the pull-down.

An input buffer for detecting that a pull-down voltage for the input / output line has reached a reference voltage;
A pulse generating circuit for generating a constant pulse having an enable period of a predetermined width when the pull-down voltage for the input / output line reaches the reference voltage;
And outputting the read data through the input / output line during the enable period of the constant pulse.

Output line and swings between an input / output reference voltage for controlling the pull-up and a reference voltage for controlling the pull-down, and outputs a pulse signal corresponding to a transition point of a transmission signal or a read command transmitted from the outside, Output line to the input / output line, performing the pull-down in response to a read command, stopping pull-down when the pull-down signal of the input / output line reaches the reference voltage and generating a first constant pulse, Output line during an enable period of the input / output line, and for sensing and outputting the data when the data is transferred to the input / output line being floated; And
A second constant pulse is generated when the pull-down signal of the input / output line reaches the reference voltage in response to the read command, and the second constant pulse is generated when the pull- Output lines during the enable period of the stunt pulse.

12. The system of claim 11,
A pulse generator for generating a pulse corresponding to a transition point of the transmission signal when the transmission signal is input;
An input / output voltage regulator maintaining the pull-up so that the input / output line maintains the input / output reference voltage or higher; And
A pull-down control unit for performing the pull-down on the input / output line in response to the input signal or the read command of the pulse generation unit, the pull-down control unit terminating when the pull-down signal reaches a preset reference voltage;
A pulse generating circuit for generating the first constant pulse having the enable period of a predetermined width when the pull-down signal of the input / output line reaches the reference voltage;
A transistor for blocking the connection between the input / output line and the input / output voltage regulator during the enable period of the first constant pulse to float the input / output line;
A first switch which is turned on at the time when the enable of the first constant pulse starts to sample the data of the input / output line;
A second switch that is turned on at a time when the enable of the first constant pulse ends and samples the data of the input / output line; And
And a double sampling differential amplifier for outputting the difference of the voltages sampled twice by the first and second switches as the read data,
Outputting the pulse signal that swings by the pull-up and the pull-down in response to the transmission signal, to the input / output line in response to the transmission signal, the voltage level of the input / output line after the pull- Serial communication system.

13. The method of claim 12,
And a variable resistor between the input / output line and the power supply line to accurately sense a high level and a low level of the data transferred from the semiconductor device to the input / output line at the time of floating the input / output line.

12. The semiconductor device according to claim 11, wherein the semiconductor device
An input buffer for comparing the pulse signal with the preset reference voltage and outputting a difference between the pulse signal and the reference voltage;
A pulse generating circuit for generating the second constant pulse having the enable period with a constant width corresponding to a transition time synchronized with the output of the input buffer; And
A toggle flip flop for restoring data having the same phase as the transmission signal using the second constant pulse in response to the write mode;
A switch for outputting the data read corresponding to the read mode through the input / output line during an enable period of the second constant pulse;
A diode for receiving a signal including the pulse signal through the input / output line; And
And a capacitor for charging the signal transmitted by the diode to generate an operating voltage.

15. The method of claim 14,
Further comprising: a sensing array for writing the data;
And the sensing array is operated using the operating voltage of the capacitor.

And sweeps between a reference voltage for controlling the pull-up and an input / output reference voltage for controlling the pull-down, and outputs a pulse signal corresponding to a transition point of the transmission signal or the read command transmitted from the outside, Output line to the input / output line, performing the pull-up in response to a read command, and terminating the pull-up when the pull-up signal of the input / output line reaches the reference voltage and generating a first constant pulse, A controller for floating the input / output line during an enable period of the pulse and for sensing and outputting data when the data is transferred to the input / output line being floated; And
Output line to a second reference voltage when the pull-up signal of the input / output line reaches the reference voltage corresponding to the read command, and outputs the read data to the second terminal Output lines during the enable period of the stunt pulse.

17. The system of claim 16,
A pulse generator for generating a pulse corresponding to a transition point of the transmission signal when the transmission signal is input;
An input / output voltage regulator maintaining the pull-down so that the input / output line maintains the input / output reference voltage or lower; And
A pull-up control unit for performing the pull-up operation on the input / output line in response to the input signal or the read command of the pulse generation unit, the pull-up control unit terminating when the voltage of the input / output line reaches a preset reference voltage;
A pulse generating circuit for generating the first constant pulse having the enable period of a predetermined width when the pull-up signal of the input / output line reaches the reference voltage;
A transistor for blocking the connection between the input / output line and the input / output voltage regulator during the enable period of the first constant pulse to float the input / output line;
A first switch which is turned on at the time when the enable of the first constant pulse starts to sample the data of the input / output line;
A second switch that is turned on at a time when the enable of the first constant pulse ends and samples the data of the input / output line; And
And a double sampling differential amplifier for outputting the difference of the voltages sampled twice by the first and second switches as the read data,
Outputting the pulse signal corresponding to the transmission signal by the pull-up and the pulldown to the input / output line in response to the transmission signal, the voltage level of the input / output line after the pull-up interruption is returned by the pull- Serial communication system.

17. The method of claim 16,
And a variable resistor between the input / output line and the power supply line to accurately sense a high level and a low level of the data transferred from the semiconductor device to the input / output line at the time of floating the input / output line.

The semiconductor device according to claim 16, wherein the semiconductor device
An input buffer for comparing the pulse signal with a preset reference voltage to output a difference between the pulse signal and a reference voltage;
A pulse generating circuit for generating the second constant pulse having the enable period with a constant width corresponding to a transition time synchronized with the output of the input buffer; And
A toggle flip flop for restoring data having the same phase as the transmission signal using the second constant pulse in response to the write mode;
A switch for outputting the data read corresponding to the read mode through the input / output line during an enable period of the second constant pulse;
A diode for receiving a signal including the pulse signal through the input / output line; And
And a capacitor for charging the signal transmitted by the diode to generate an operating voltage.

20. The method of claim 19,
Further comprising: a sensing array for writing the data;
And the sensing array is operated using the operating voltage of the capacitor.

A first mode switch for turning on in response to the first switching mode; And
And a second mode switch that turns on in response to the second switching mode,
In response to the turn-on of the first mode switch,
Output line and a first reference voltage for controlling the pull-down, and is configured to swing between a first reference voltage for controlling the pull-up and a first reference voltage for controlling the pull-down, Outputting a first pulse signal to the input / output line, performing the pull-down in response to a read command, generating a constant pulse when the pull-down signal of the input / output line reaches the first reference voltage, Output line during an enable period of a stunt pulse, and when data is transferred to the floating input / output line, the data is sensed and output,
In response to the turn-on of the second mode switch,
Output lines, swinging between a second reference voltage for controlling the pull-up and a second input / output reference voltage for controlling the pull-down and controlling the pull-up and pull-down of the transmission signal or the read command Output line and outputs the second pulse signal corresponding to the transition point to the input / output line, performs the pull-up in response to the read command, terminates the pull-up when the pull-up signal of the input / output line reaches the second reference voltage, Output line during an enable period of the constant pulse, and when the data is transferred to the floating input / output line, the controller senses the data and outputs the sensed data.