CN112115671A - Circuit structure for improving electromagnetic radiation of clock signal end of processor and forming method thereof - Google Patents
Circuit structure for improving electromagnetic radiation of clock signal end of processor and forming method thereof Download PDFInfo
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Abstract
The invention provides a circuit structure for improving electromagnetic radiation of a clock signal end of a processor and a forming method thereof, wherein the circuit structure for improving the electromagnetic radiation of the clock signal end of the processor comprises the processor, the processor comprises at least one clock signal end, a functional module, a pulse width modulation signal port and an IO port, the functional module is electrically connected with the clock signal end, and a circuit is electrically connected between the pulse width modulation signal port and the IO port to form at least one cancellation loop, so that the electromagnetic radiation generated by the electrical connection between the clock signal end and the functional module is cancelled. The circuit structure for improving the electromagnetic radiation of the clock signal end of the processor can not only realize the electromagnetic field offset by using the elements in the processor, thereby realizing the improvement of the electromagnetic radiation of the clock signal end of the processor, but also can not generate additional electromagnetic radiation.
Description
Technical Field
The invention relates to the technical field of electromagnetic radiation, in particular to a circuit structure for improving electromagnetic radiation of a clock signal end of a processor.
Background
With the increasing popularization of electronic products, the requirements on the safety of the electronic products are also increasing, electromagnetic radiation becomes a focus of much attention of people, and the electromagnetic radiation is mainly checked through an EMC test, which is also called as electromagnetic compatibility EMC, which refers to the comprehensive evaluation of EMI and anti-interference capability EMS of the electronic products in the aspect of electromagnetic field, and is one of the most important indexes of the quality of the electronic products, and the purpose of the method is to detect the influence of the electromagnetic radiation generated by the electronic products on human bodies, public place power grids and other normally working electric products. The electromagnetic compatibility is a subject of researching that various electric equipment can coexist in a broad sense and organisms can be contained under the condition of limited space, time and frequency spectrum resources without causing degradation, and comprises two parts of electromagnetic interference and electromagnetic sensitivity, wherein the electromagnetic interference test is to measure the magnitude of electromagnetic wave signals generated and emitted by the tested equipment in a normal working state to reflect the strength of interference on surrounding electronic equipment, and the electromagnetic sensitivity test is to measure the strength of the anti-interference capability of the tested equipment on electromagnetic disturbance.
The RE test in the EMC test of the PCB level of the electronic product is a very important parameter in the safety standard test index of the circuit board, various international standards have strict requirements on the index, and because electromagnetic radiation often appears in a plurality of unpredictable frequency bands, the RE test can be reflected according to the actual test condition, therefore, the RE test is easy to exceed the standard, and for each electronic product, an electronic hardware engineer of the electronic product can spend a plurality of times and a plurality of test costs to solve the problem.
The problem is solved by accurately positioning the problem, and the problem is not rectified and modified in the positioning process and is collided everywhere like a headless fly. The problem positioning has two means, firstly, the problem positioning needs to be judged by taking the intuition judgment of an engineer and completely depending on EMC experience accumulated by the engineer; and secondly, a comparison test is carried out, and the problem is subjected to detailed positioning judgment by combining an instrument and EMC experience. Generally, two aspects are considered, namely, various power cables and signal cables connected with machine equipment are detected and positioned through plugging, and then different rectification measures are taken according to phenomena; secondly, whether the structural design is reasonable or not has a larger relation, and the leakage of the shielding body can have great influence on the RE radiation superscript.
The conventional solutions for RE radiation are roughly two, one is to find a radiation source and reduce radiation by modifying electrical parameters of circuit resistance, so that although the problem of standard exceeding of RE test is reduced, other problems are often introduced, such as poor signal quality caused by reduction of signal driving capability, and more experiments are needed to demonstrate stability of the method.
In addition, a part of signals are difficult to remove from the circuit due to the circuit structure itself, and in this case, it is common practice in the prior art to shield the generated electromagnetic radiation by adding a metal shielding frame. However, this method also has its inherent disadvantages, firstly, because the metal shielding frame is added, the number of parts of the circuit structure itself and the volume of the circuit structure are inevitably increased, which obviously limits the applicability for some small and miniature electronic products; in addition, the addition of the metal shielding frame also increases the cost, which affects the cost control of the product and the consumer acceptance.
Fig. 1 shows a test picture of RE radiation in the prior art. As shown in the figure, four points 1, 2, 3 and 4 are points with excessive EMC, wherein the frequency of the point 1 is 125MHZ, the frequency of the point 2 is 375MHZ, the frequency of the point 3 is 625MHZ, the frequency of the point 4 is 875MHZ, the frequency of the point 125MHZ is a clock source, and beyond the standard, the other 3 frequencies are 3,5 and 7 times the frequency of the point 125MHZ respectively, and the line pressing condition also exists.
Disclosure of Invention
One advantage of the present invention is to provide a circuit structure for improving electromagnetic radiation at a clock signal end of a processor, which can achieve electromagnetic field cancellation by using components inside the processor, thereby achieving improvement of electromagnetic radiation at the clock signal end of the processor.
One advantage of the present invention is to provide a circuit structure for improving electromagnetic radiation at a clock signal end of a processor, where the circuit structure for improving electromagnetic radiation at a clock signal end of a processor utilizes redundant PWM interface or IO interface resources of a processor chip, and adds a path of reverse 125M clock signals, and uses at least 1 PCB traces with opposite directions according to a theoretical and practical phenomenon that electromagnetic fields can cancel each other, so as to digest the electromagnetic fields inside, thereby improving the electromagnetic radiation at a clock signal end of a processor.
One advantage of the present invention is to provide a circuit structure for improving electromagnetic radiation at a clock signal end of a processor, where cancellation loops are provided on the basis of the existing processor structure, so that a part of lines of each cancellation loop run parallel to and opposite to lines that originally generate radiation, thereby achieving cancellation of electromagnetic radiation in the circuit structure.
One advantage of the present invention is to provide a circuit structure for improving electromagnetic radiation at a clock signal end of a processor, wherein a layer number position of a PCB board on which a part of lines of each cancellation loop are located is the same as a layer number position of a PCB board on which lines between the clock signal end of the processor and a functional module are located, thereby improving a cancellation effect of electromagnetic radiation.
One advantage of the present invention is to provide a circuit structure for improving electromagnetic radiation at clock signal end of a processor, wherein the rest of the lines of each cancellation loop are located in the inner layer of the PCB board, thereby reducing the generation of additional electromagnetic radiation.
An advantage of the present invention is to provide a circuit structure for improving electromagnetic radiation at a clock signal end of a processor, wherein an operating frequency of an idle pulse modulation width (PWM) signal port of the processor is consistent with an operating frequency of the clock signal end, so as to enhance an electromagnetic cancellation effect of the circuit structure for improving electromagnetic radiation at the clock signal end of the processor and reduce a probability of additional electromagnetic radiation generated by a cancellation loop.
Another advantage of the present invention is to provide a method for forming a circuit structure for improving electromagnetic radiation at a clock signal end of a processor, which is adapted by using an existing structure of the processor, and uses a right-handed spiral theorem or the like to achieve self-cancellation of electromagnetic radiation generated by the processor during operation, and the method is simple and has reliable effect.
Another advantage of the present invention is to provide a method for forming a circuit structure for improving electromagnetic radiation at a clock signal end of a processor, where the method for forming a circuit structure for improving electromagnetic radiation at a clock signal end of a processor can control current and operating frequency in a cancellation loop through software, so as to improve cancellation effect of generated electromagnetic radiation, and is simple to operate and wide in application range.
To achieve at least one of the above advantages, the present invention provides a circuit structure for improving electromagnetic radiation at a clock signal end of a processor, where the circuit structure includes a processor, the processor includes at least a clock signal end, a functional module, a pwm signal port, and an IO port, where the functional module is electrically connected to the clock signal end, and a line is electrically connected between the pwm signal port and the IO port to form at least one cancellation loop, so as to cancel electromagnetic radiation generated by electrical connection between the clock signal end and the functional module.
In some embodiments, the clock signal terminal and the functional module are electrically connected through a first connection line, and the cancellation loop includes at least a second connection line, wherein the second connection line and the first connection line are parallel to each other and have opposite current directions.
In some embodiments, the processor further comprises at least one PCB board, and the first connection circuit and the second connection circuit are disposed on the PCB board.
In some embodiments, the first connection circuit and the second connection circuit are both disposed on a surface layer of the PCB board.
In some embodiments, the rest of the connecting lines except for the second connecting line in the cancellation loop are disposed in an inner layer of the PCB.
In some embodiments, the operating frequency of the clock signal terminal is 25MHz or a multiple thereof.
In some embodiments, the operating frequency of the pwm signal port is identical to the operating frequency of the clock signal port.
The invention further includes a method of forming a circuit structure for improving electromagnetic radiation at the clock signal side of a processor, comprising the steps of:
1001: selecting at least one idle IO port and one pulse modulation width signal port on a processor, and electrically connecting the IO port and the pulse modulation width signal port through at least one circuit to form at least one cancellation loop; and
1002: the first connecting circuit is electrically connected between a clock signal end on the processor and a functional module to form a first connecting circuit, and a part of circuits in the cancellation loop are second connecting circuits; and
1003: adjusting the second connection line to be opposite to the current direction of the first connection line.
Drawings
FIG. 1 is a diagram illustrating a structure of a prior art test for a processor clock signal side EMC superscalar.
Fig. 2 is a schematic diagram of an electromagnetic field direction structure of a radiation signal line generated in the first embodiment of the circuit structure for improving electromagnetic radiation at a clock signal terminal of a processor according to the present invention.
Fig. 3 is a schematic diagram of the structure of the electromagnetic field direction of the signal line added in the first embodiment of the circuit structure for improving the electromagnetic radiation at the clock signal end of the processor according to the present invention.
Fig. 4 is a schematic structural diagram of a first embodiment of a circuit structure for improving electromagnetic radiation at a clock signal end of a processor according to the present invention.
FIG. 5 is a diagram illustrating the result of the EMC test of the circuit configuration for improving the electromagnetic radiation at the clock signal side of the processor according to the present invention.
FIG. 6 is a flow chart illustrating a method for forming a circuit structure for improving electromagnetic radiation at a clock signal side of a processor according to the present invention.
Detailed Description
The following description is presented to disclose the invention so as to enable any person skilled in the art to practice the invention. The preferred embodiments in the following description are given by way of example only, and other obvious variations will occur to those skilled in the art. The basic principles of the invention, as defined in the following description, may be applied to other embodiments, variations, modifications, equivalents, and other technical solutions without departing from the spirit and scope of the invention.
It is understood that the terms "a" and "an" should be interpreted as meaning that a number of one element or element is one in one embodiment, while a number of other elements is one in another embodiment, and the terms "a" and "an" should not be interpreted as limiting the number.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
As shown in fig. 2 to fig. 5, the present invention mainly provides a circuit structure for improving electromagnetic radiation of a clock signal terminal 111 of a processor 11, where the circuit structure for improving electromagnetic radiation of the clock signal terminal 111 of the processor 11 includes a processor 11 and a functional module 112, where the processor 11 includes at least one clock signal terminal 111, a functional module 112, a pulse width modulation signal port 113 and an IO port 114, where the functional module 112 is electrically connected to the clock signal terminal 111, and a line 116 is electrically connected between the pulse width modulation signal port 113 and the IO port 114 to form at least one cancellation loop 115, so as to cancel electromagnetic radiation generated by electrical connection between the clock signal terminal 111 and the functional module 112.
Specifically, as shown in fig. 2 and 3, a plurality of lines are provided to connect the output terminal, the functional module 112, and the input terminal, respectively, with a plurality of pwm signal ports 113 of the processor 11 as output terminals and a plurality of idle IO ports 114 of the processor 11 as input terminals, thereby forming a plurality of cancellation loops 115.
As shown in fig. 3, a part of the line of each cancellation loop 115 runs parallel to the line between the clock signal terminal 111 of the processor 11 and the function module 112, and the current of the cancellation loop 115 runs opposite to the current in the line between the clock signal terminal 111 of the processor 11 and the function module 112.
As shown in fig. 4 and fig. 5, according to the theory and the actual phenomenon that electromagnetic fields can cancel each other, the idle pwm signal port 113 and the IO port 114 on the processor 11 are connected to form the cancellation loop 115, and a part of the line of the cancellation loop 115 is parallel to the line between the clock signal terminal 111 and the functional module 112 of the processor 11, and the processor 11 is used to control the current direction in the cancellation loop 115, so that the current direction in the cancellation loop 115 is opposite to the current direction in the line between the clock signal terminal 111 and the functional module 112 of the processor 11.
Then, according to the right-hand spiral law, an electromagnetic field with the direction opposite to that of the electromagnetic field between the clock signal terminal 111 and the functional module 112 is generated in the counteracting loop 115, and the electromagnetic fields with the opposite directions can counteract each other, so that the electromagnetic radiation of the clock signal terminal 111 can be reduced in an auxiliary manner on the basis of adopting other radiation standard exceeding improving problems such as adding a metal shielding mechanism and the like, thereby further improving the standard exceeding problem of the radiation test, enabling the standard exceeding problem to reach the electromagnetic compatibility test standard, and improving the quality level of electronic products. As described above, compared with the structure for reducing electromagnetic radiation in the prior art, the circuit structure for improving electromagnetic radiation of the clock signal terminal 111 of the processor 11 according to the present invention is not only simple in structure, but also is configured according to the electromagnetic cancellation principle, so that the working effect is stable.
Preferably, in the first embodiment of the present invention, the processor 11 includes a PCB board, and the connection line between the clock signal terminal 111 and the functional module 112 of the processor 11 is a first connection line 117, and the first connection line 117 is disposed on the PCB board. Correspondingly, each cancellation loop 115 includes a second connection line 1161, where the second connection line 1161 is a line parallel to the first connection line 117 and opposite in current direction, and the layer number position of the PCB where the second connection line 1161 is located is the same as the layer number position of the PCB where the first connection line 117 is located between the clock signal terminal 111 of the processor 11 and the functional module 112.
Since the second connection line 1161 in the cancellation loop 115 is parallel to and opposite to the first connection line 117 between the clock signal terminal 111 of the processor 11 and the functional module 112, the electromagnetic field cancellation effect can be improved by disposing the second connection line 1161 in the cancellation loop 115 at the same layer position as the first connection line 117 between the clock signal section and the functional module 112 on the PCB.
Further, the first connection line 117 between the clock signal terminal 111 and the functional module 112 is disposed on the surface layer of the PCB, so as to reduce line consumption and ensure signal transmission quality. However, at the same time, the first connection circuit 117 is disposed on the surface of the PCB such that the electromagnetic radiation thereof is relatively high, and therefore, the second connection circuit 1161 in the cancellation circuit 115 is also disposed on the surface of the PCB, so as to maximally cancel the electromagnetic radiation generated by the first connection circuit 117.
The remaining connecting lines 1162 of the canceling circuit 115 except for the second connecting line 1161 are disposed on an inner layer of the PCB, so that the electromagnetic radiation generated by the remaining connecting lines 1162 of the canceling circuit 115 is blocked by the structure of the PCB, thereby preventing the circuit structure for improving the electromagnetic radiation of the clock signal terminal 111 of the processor 11 from generating additional electromagnetic radiation.
Preferably, in the circuit structure for improving electromagnetic radiation of the clock signal terminal 111 of the processor 11 according to the present invention, since the operating frequency of the clock signal terminal 111 in the electronic circuit for practical application is 25MHz or a frequency multiplication of 25HMz, such as 125HMz, etc., only a software test is needed to set the operating frequency of the corresponding pulse modulation width signal terminal in the processor 11 to be consistent with the operating frequency thereof, so that the electromagnetic fields generated by the two terminals have the same intensity and are more likely to cancel each other, and the probability of generating additional electromagnetic radiation by the cancellation loop 115 can also be reduced.
Preferably, the second connection line 1161 in the cancellation loop 115 is disposed on the left and right sides of the second connection line 1161 between the clock signal end 111 and the function module 112, so as to further improve the cancellation effect of the cancellation loop 115 on electromagnetic radiation.
Besides, those skilled in the art can adjust the specific position of the second connection line 1161 in the cancellation circuit 115 according to actual conditions, for example, the second connection line 1161 in the cancellation circuit 115 is disposed at an interval on one side of the first connection line 117, and the like, which all fall within the protection scope of the present invention. In other words, as long as the same or similar technical solution as the present invention is adopted on the basis of the above disclosure, the same or similar technical problem as the present invention is solved, and the same or similar technical effect as the present invention is achieved, all of which belong to the protection scope of the present invention, and the specific implementation manner of the present invention is not limited thereto.
As described above, if the radiation in the radiation test is uniform narrow-band spike group noise, the calculator may separate what the frequency difference is, and this frequency difference may be the fundamental frequency of its radiation source, and if the radiation test is single spike noise, it needs to see whether this spike noise and the clock frequency on the board have a frequency multiplication relationship, so that the problem can be solved by the circuit structure for improving the electromagnetic radiation of the clock signal terminal 111 of the processor 11 according to the present invention.
As shown in fig. 6, the present invention further provides a method for forming a circuit structure for improving electromagnetic radiation of the clock signal terminal 111 of the processor 11, and the method for forming a circuit structure for improving electromagnetic radiation of the clock signal terminal 111 of the processor 11 comprises the steps of:
1001: selecting at least one idle IO port 114 and one pwm signal port on a processor 11, and electrically connecting the IO port 114 and the pwm signal port through at least one line 116 to form at least one cancellation loop 115; and
1002: electrically connecting a clock signal terminal 111 of the processor 11 and a functional module 112 to form a first connection line 117, wherein a part of the cancellation circuit 115 is a second connection line 1161; and
1003: the second connection line 1161 is adjusted to be opposite to the current direction of the first connection line 117.
In step 1001, since the direction and the position of the first connection line 117 between the clock signal terminal 111 and the functional module 112 on the processor 11 can be known in advance, several spare IO ports 114 and pulse modulation width signal ports can be selected in design, so as to design a plurality of cancellation loops 115.
In step 1003, the position of the second connection line 1161 includes, but is not limited to, being disposed on two sides of the first connection line 117 or being spaced apart from one side of the first connection line 117, so as to improve the cancellation effect of the cancellation loop 115 on electromagnetic radiation.
In the first embodiment of the present invention, the second connection line 1161 is disposed in parallel with the position of the first connection line 117, thereby enhancing the cancellation effect of electromagnetic radiation.
Preferably, in step 1003, the operating frequency of the pwm width signal port in the processor 11 is consistent with the frequency of the clock signal terminal 111 in the processor 11, so that the electromagnetic field strength generated by the cancellation loop 115 is equivalent to the magnetic field strength generated between the clock signal terminal 111 and the functional module 112, so as to easily achieve mutual cancellation, and in addition, the probability of generating additional electromagnetic radiation by the cancellation loop 115 can be reduced.
Still further, in the first embodiment of the method for forming the circuit structure for improving electromagnetic radiation of the clock signal terminal 111 of the processor 11 according to the present invention, the operating frequency of the clock signal terminal 111 is 25MHz or a multiple of 25MHz, such as 125 MHz.
Preferably, in step 1002, the positions of the layers of the PCB board of the processor 11 where the second connection lines 1161 are located coincide with the positions of the layers of the first connection lines 117, so that the magnetic field generated by the second connection lines 1161 can better cancel the magnetic field generated by the first connection lines 117.
Further, the first connection line 117 and the second connection line 1161 are disposed on a surface layer of the PCB board in the processor 11, so that the line signal of the first connection line 117 is reduced, and the quality of signal transmission is ensured.
Besides, those skilled in the art can determine the specific positions of the first connection line 117 and the second connection line 1161, the operating frequency of the clock signal terminal 111, and the like according to actual situations. That is, as long as the technical solution same as or similar to the present invention is adopted on the basis of the above disclosure of the present invention, the technical problem same as or similar to the present invention is solved, and the technical effect same as or similar to the present invention is achieved, all of which belong to the protection scope of the present invention, and the specific embodiment of the present invention is not limited thereto.
In other words, in the method for forming the circuit structure for improving electromagnetic radiation at the clock signal terminal 111 of the processor 11 according to the present invention, the number of the cancellation loops 115 may be determined according to actual requirements or according to the structure of the processor 11, for example, a plurality of cancellation loops 115 are designed according to requirements, so as to enhance the electromagnetic cancellation effect on the circuit structure for improving electromagnetic radiation at the clock signal terminal 111 of the processor 11 according to the present invention.
Further, in the method for forming the circuit structure for improving the electromagnetic radiation of the clock signal terminal 111 of the processor 11, after the PCB in the processor 11 is processed, an electromagnetic compatibility test (EMC) is performed on the PCB, so as to determine an excessive point of a Radiation Emission (RE) test of the PCB and a range of the cancellation loop 115 where the excessive point is located, so as to select one or more corresponding cancellation loops 115, and software is used to allocate and control the current and the working frequency in the cancellation loop 115, so that the current and the working frequency are consistent with the working frequency of the clock signal terminal 111 in the processor 11, and a far-field antenna is used to observe the radiation condition in real time until the best position of the cancellation loop 115 is found.
Finally, these parameters are stored in the system of the processor 11, and when there are various circuits generating radiation emission signals, the corresponding cancellation loop 115 is opened, so as to self-eliminate the radiation emission test superscript point on the whole PCB in the processor 11, so that the electromagnetic radiation emission test of the clock signal terminal 111 in the working process of the PCB in the processor 11 meets the specification requirements.
It will be appreciated by persons skilled in the art that the embodiments of the invention described above and shown in the drawings are given by way of example only and are not limiting of the invention. The objects of the invention have been fully and effectively accomplished. The functional and structural principles of the present invention have been shown and described in the examples, and any variations or modifications of the embodiments of the present invention may be made without departing from the principles.
Claims (10)
1. The utility model provides a circuit structure for improving treater clock signal end electromagnetic radiation, its characterized in that, a circuit structure for improving treater clock signal end electromagnetic radiation includes a treater, the treater includes at least one clock signal end, a functional module, a pulse width modulation signal port and an IO port, wherein the functional module with clock signal end electric connection, pulse width modulation signal port with an electric connection circuit forms at least one cancellation loop between the IO port, thereby offset the clock signal end with electric connection and the electromagnetic radiation that produces between the functional module.
2. The circuit structure for improving electromagnetic radiation at a processor clock signal end as claimed in claim 1, wherein said clock signal end is electrically connected to said functional module through a first connecting circuit, and said cancellation circuit comprises at least a second connecting circuit, wherein said second connecting circuit and said first connecting circuit are parallel to each other and have opposite current directions.
3. The circuit structure for improving processor clock signal side electromagnetic radiation of claim 2, wherein said processor further comprises at least one PCB board, said first connection circuit and said second connection circuit being disposed on said PCB board.
4. The circuit structure for improving processor clock signal side electromagnetic radiation of claim 3, wherein said first connection circuit and said second connection circuit are both disposed on a surface layer of said PCB board.
5. The circuit structure for improving processor clock signal side electromagnetic radiation according to any one of claims 2 to 4, wherein the remaining connecting lines of the cancellation loop except the second connecting line are disposed at an inner layer of the PCB board.
6. The circuit arrangement for improving processor clock signal side electromagnetic radiation according to claim 5, wherein said clock signal side operating frequency is 25MHz or a multiple thereof.
7. The circuit arrangement for improving processor clock signal side electromagnetic radiation of claim 6, wherein said pulse width modulated signal port has an operating frequency that is coincident with an operating frequency of said clock signal side.
8. A method for forming a circuit structure for improving electromagnetic radiation at a clock signal side of a processor, comprising the steps of:
1001: selecting at least one idle IO port and one pulse modulation width signal port on a processor, and electrically connecting the IO port and the pulse modulation width signal port through at least one circuit to form at least one cancellation loop; and
1002: the first connecting circuit is electrically connected between a clock signal end on the processor and a functional module to form a first connecting circuit, and a part of circuits in the cancellation loop are second connecting circuits; and
1003: adjusting the second connection line to be opposite to the current direction of the first connection line.
9. The method as claimed in claim 8, wherein said processor comprises a PCB board, and said first connection circuit and said second connection circuit are respectively disposed on a surface layer of said PCB board.
10. The method of claim 9 wherein said pwm width signal port in said processor is operated at a frequency consistent with an operating frequency of said clock signal terminal.
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