JPH09106391A - Control equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily perform the reloading of an electrically erasable and rewritable storage means without extending a substrate area or the number of parts by incorporating a loader in an MPU for carrier driving device control. SOLUTION: This equipment has a microcomputer 5' for controlling an object (CD-ROM driving device) 10 to be controlled while being connected with a host computer 8. Then, the equipment has an electrically erasable and rewritable storage means 5a' externally attached on or incorporated in the microcomputer 5' and inside the microcomputer 5', a non-volatile storage means 5c is arranged for erasing and rewriting the program of the electrically erasable and rewritable storage means 5a' through the host computer 8. Thus, complexity at the time of exchange, when the firmware of a ROM is changed, is canceled and the reloading of the flash ROM 5a' can be performed without extending the substrate area or the number of parts.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a control device for controlling a carrier driving device and the like, and more particularly to an improvement of a control device in which a microcomputer has a loader for erasing and writing electrically erasable and rewritable storage means. Regarding

[0002]

2. Description of the Related Art Conventionally, for example, a CD-ROM driving device is known as a control device having a microcomputer connected to a host computer and controlling a carrier driving device. Various types of CD-ROM drive devices have been proposed, and are usually composed of a drive mechanism, a drive controller, and an interface protocol controller serving as a host interface.

FIG. 5 shows a basic structure of a conventional CD-ROM drive device 10. Disk 1 for CD-ROM in FIG.
CD-ROM extracted from the optical pickup 2 via the optical pickup 2
The data is supplied to the CD-DA data processor 3 via an RF signal processor (not shown).

The EF is stored in the CD-DA data processor 3.
M (Eight to Fourteen Modulator) demodulation circuit, CIR
A computer data including a C (Cross Interleave Read-Solomon Code) decoder and the like, which is picked up from the CD-ROM disc 1 after error correction such as CIRC is C
It is supplied to the D-ROM data processor 4.

Within the CD-ROM data processor 4 is a C
A D-ROM decoder 4a, a sub-buffer memory 4b, a CD-ROM error correction circuit (not shown), and a buffer memory manager circuit (hereinafter referred to as BMM).
4c.

The CD-ROM data processor 4 is controlled by a microcomputer (hereinafter referred to as MPU) 5.
MPU5 is a normal external ROM (nonvolatile memory circuit) 5
a and a RAM (volatile memory circuit) 5b for work are provided.

Read from the CD-ROM disc 1,
The computer data stored in the sub-buffer memory 4b is controlled via the MPU 5 and the BMM 4c and supplied to the interface / protocol controller 6.
A host computer (H-CPU) 8 via an interface bus 7 such as SCSI (Small Computer System Interface) or ATAPI (ATA Packet Interface)
It is designed to be supplied to. Also, ROM in MPU5
There is also known an IC in which 5a and RAM 5b are integrated together.

A mask ROM is used as the ROM 5a.
And rewritable EPROM (Erasable P
ROM) is used.

R of MPU5 using such EPROM
A flowchart at the time of rewriting the firmware of the OM5 is as shown in FIG.

That is, as shown in the first step S _{1 in} FIG.
From CPU8 body taken out the CD-ROM drive 10, take out the EPROM5a to decompose the CD-ROM drive 10 as shown in the second step S _2.

Next third step S_ThreeThen EPROM 5a
Is erased with ultraviolet rays, and the fourth step S _FourThen ROM writer
Write new firmware to EPROM 5a by
Including the 5th step S_FiveThen, the CD-ROM drive 10
EPROM 5a with new firmware written in
Re-set, 6th step S₆CD-RO as shown in
Assemble M drive device 10 and check if it works properly
After doing the 7th step S₇To the main body of H-CPU8
It is designed to incorporate the CD-ROM drive 10.
Was.

[0012]

As described above, the EPROM is used.
When such a method is used, a process such as the above-described flowchart is frequently repeated in a firmware or the like that is not initially completed and has a high degree of completeness, which requires a lot of time and labor.

As a method of saving such troublesome work, an electrically erasable and rewritable EAROM (Electrical)
ly Alterable ROM) and EEPROM (Electrically Era)
sable P ROM) or flash memory (Flash Memor
y) etc., the CD-ROM drive device 10 can be used as an H-CP.
Since new firmware can be electrically written without being taken out from U8, rewriting can be performed in a short time without the need for disassembling and the like.

It is now assumed that the ROM 5a shown in FIG. 5 is replaced with the above electrically erasable and rewritable flash memory. In this case, flash memory (RO
A software program (loader) for electrically erasing and rewriting the firmware in M) is required. However, if this loader is built in the flash memory, the ROM contents are transferred once to the RAM 5b at the time of erasing, and RA
The new firmware is written in the flash memory by the software program of the loader stored in M.

Therefore, if a bug occurs in the loader transferred to the RAM 5b, or if the power is cut off due to a power failure or the like while transferring to the RAM 5b and writing new firmware, the loader software program itself is also erased. Problem occurs.

The present invention has been made in order to solve the above problem. The problem is to eliminate the soft program of the loader that occurs when the ROM is replaced by incorporating the loader as a mask ROM in the MPU. The flash memory is rewritten by a loader that does not generate any bugs.

[0017]

The control device of the present invention is a control device having a microcomputer 5 ', which is connected to a host computer 8 as shown in FIG. In the microcomputer 5 ', an electrically erasable and rewritable storage means 5a' is provided externally or internally, and the electrically erasable and rewritable storage means is provided in the microcomputer 5'via a host computer. A nonvolatile storage means 5c for erasing and rewriting the program 5a 'is provided.

Since the present invention is configured and operated as described above, the complexity of replacing the ROM firmware is eliminated and the loader is a mask ROM with a built-in MPU to increase the board area and the number of parts. Flash RO without
M can be rewritten.

[0019]

BEST MODE FOR CARRYING OUT THE INVENTION A control device of the present invention applied to a CD-ROM driving device as a controlled device will be described below. As a controlled device, a CD-R (CD Recordabl
e) It is applicable to a drive device, a hard disk drive device, a magneto-optical disk drive device, a tape magnetic drive device, and a recording and / or reproducing device having an MPU 5 '.

In the following, one embodiment of the present example will be described as C to be controlled.
The D-ROM drive device 10 is connected to a host computer (HC
The control device 21 controlled via the PU 8 will be described in detail.

In FIG. 1, 1 is a CD-ROM disc or C
It is a D-DA (CD Digital Audio) disk, and is placed on a turntable 12 which is rotationally driven by a spindle motor 11. Although not shown in the figure, the CD-ROM or CD-DA disk (hereinafter referred to as a disk) placed on the tray is turned table 12 via a tray motor.
Placed on top.

The optical pickup 2 is arranged below the disc 1 and is movable in the radial direction of the disc 1 by a feed motor 13. Spindle motor 1 described above
1, a feed motor 13, a tray motor (not shown), and an optical pickup 2 are controlled by a microcomputer (hereinafter referred to as MPU) 5'by a servo circuit 14 and various drive circuits 1
5 is controlled.

That is, the various drive circuits 15 include the actuator drive circuit of the optical pickup 2 and perform focus servo and tracking servo of the laser beam of the optical pickup. Astigmatism method is used for focus detection and three beam method is used for tracking servo. Used.

Further, the feed motor 13 is roughly seeked in the radial direction of the disk by the feed motor drive circuit, and the spindle motor 11 has, for example, a quadruple speed drive circuit with a 2 × r. p. m,
About 800r. p. m, and spindle motor servo is performed so that the rotation speed changes.

The CD-ROM data or CD-DA data from the disc 1 read from the optical pickup 2 is supplied to the RF signal processor 16. The RF signal processor 16 includes an RF amplifier, a servo error amplifier, and the like, and the focus and tracking error signals necessary for the servo of the optical pickup 2 receive the servo circuit 14.
Is supplied to the CD-D and EFM data is generated.
It is supplied to the A data processor 3.

The CD-DA data processor 3 includes an EFM demodulation circuit, a PLL circuit, and a CD-DA error correction circuit, and performs EFM demodulation and error correction of the CD-DA data layer to reproduce a CD-DA disc. Is
This processed data is converted into a digital-analog conversion circuit (DAC)
An analog signal is converted at 17, and left and right (L, R) signals are output to an output terminal 19 via a low-pass filter and an amplifier (LPF / AMP) 18 and emitted from a speaker or the like, and also to an earphone 20 or the like. Is also supplied.

The CD-DA data processor 3 is an MPU
Data and addresses are exchanged via 5'and a bus. When reproducing a CD-ROM disc, the output of the CD-DA data processor 3 is C as computer data.
It is supplied to the D-ROM data processor 4.

In the CD-ROM data processor 4, C
D-ROM decoder 4a, sub-buffer memories 4b, B
It includes an MM circuit 4c and a CD-ROM error correction circuit 4d. CD-ROM data stream is CD-R
It is decoded by the OM decoder 4a and stored in the sub-buffer memory 4b. Further, error correction is performed by the CD-ROM error correction circuit 4d.

The bus of MPU 5'is BMM4c and CD-.
Data and addresses are exchanged with the ROM error correction circuit 4d and the interface protocol controller 6 via the bus. The CD-ROM data stored in the sub-buffer memory 4b is stored in the host computer (H
It is supplied to the H-CPU 8 via the interface protocol controller 6 which is an interface of the CPU 8 and the SCSI or ATAPI bus 7.

The MPU 5'controls the optical pickup 2 associated with the reading of the data from the disc, and controls the CD-DA data processor 3, the CD-ROM data processor 4 and H.
-All drive operations such as data transfer to the CPU 8 are collectively processed.

The CD-ROM drive device 10 having the above structure
In this case, the flash ROM 5a 'and the RAM 5b' are externally attached to or built in the MPU 5'as described in FIG.

The flash ROM 5 is provided in the MPU 5 '.
It incorporates a loader 5c for erasing a'and writing new firmware. This loader is composed of a mask ROM composed of non-volatile storage means.

This loader is also composed of a software program, but the program size of the loader is small and debugging is easy, so there is absolutely no doubt that a high-level software program without bugs can be completed at an early stage. Therefore, even if this loader is configured with the mask ROM 5c, there is little concern.

On the other hand, considering the case where the firmware of the CD-ROM drive device is directly written in the mask ROM, in this case, the program size is large, debugging takes time, and specification changes and function expansion are performed in the middle. Due to this, it is often impossible to make a mask ROM from the beginning. Therefore, only the soft program as the loader 5c is put in the mask ROM with built-in MPU 5 ', and the firmware of the CD-ROM drive is supplied to the flash ROM 5a' so that it can be easily rewritten.

2 and 3 show H- as the control device 21.
CD-ROM based on a rewrite command from CPU8
3 shows an overall flow chart and its response diagram when writing new firmware to the flash ROM 5a 'through the mask ROM 5c built in the MPU 5'in the drive unit 10. FIG.

As shown in the response diagram of FIG. 3, the loader 5 of the MPU 5'from the H-CPU 8 side to the CD-ROM drive 10 side.
When a rewrite command is given to c, the MPU 5'side erases the original firmware of the flash ROM 5a 'based on the software program of the loader 5c.
At this time, the first step ST shown in the flowchart of FIG.
To ₁ as the setting of rewriting permission of the flash ROM5a '. This is to supply the data to the write line WR by turning on the switching means 21 inserted in the normally open state between the mask ROM 5c and the flash ROM 5a 'shown in FIG. 1 on the basis of a predetermined ID or the like. Has been done.

Next, when the MPU 5'issues an OK response signal to the H-CPU 8, the H-CPU 8 transfers the newly rewritten firmware to the MPU 5'side via the SCSI bus 7 or the like. That is, as shown in the second step ST ₂ of FIG.
The erasing and rewriting of the flash ROM 5a 'are completed via the loader 5c containing the mask ROM incorporated in the PU 5'.

When all the new firmware is written in the flash ROM 5a ', the MPU 5'verifies the data written in the flash ROM 5a' by comparing and checking it.
y) When the OK signal is responded to the H-CPU 8 side after the operation, the flash ROM 5a ′ is shown as in the third step ST ₃ of FIG.
The H-CPU 8 makes a non-rewritable setting to reach the end. In this case, switching means (see FIG. 1) 2
1 is made "off" so that it is never written.

A detailed flowchart for writing the above new firmware in the flash ROM will be described with reference to FIG.

In FIG. 4, the MPU of the CD-ROM drive unit 10
When rewriting the new firmware to the 5'flash ROM 5a ', H-like the first step STP ₁
CPU8 from 'rewriting instruction is given MPU 5 as a second step STP _2' MPU 5 of the CD-ROM drive device 10 activates the loader 5c soft program is written in the mask ROM built in MPU 5 '. At this time, of course, the ID is exchanged, and confirmation is made when the rewriting permission is set.

Next, the MPU 5'closes the switching means 21 and connects the write line (WR) as in the third step STP ₃ .

In the next fourth step STP ₄ , the loader 5c
The contents of the old firmware of the flash ROM 5a 'are erased based on the above.

In the fifth step STP ₅ , the OK signal in which the old firmware is erased from the MPU 5'in the CD-ROM drive 10 is transferred to the H-CPU 8.

In the next sixth step STP ₆ , the H-CPU
Transfer the new firmware from 8 to MPU 5'side.

In the next seventh step STP ₇ , the H-CPU
The firmware data transferred from the memory 8 is recorded in the flash ROM 5a '.

In the next seventh step STP ₇ , MPU 5 '
Determines whether all of the firmware stored in the flash ROM 5A ', is returned to the head of the sixth step STP ₆ If NO, the ninth step S if YES
Move to TP ₉ .

The tenth step S after the ninth step STP ₉ of comparison, the verify operation checks etc. were made
The TP ₁₀ causes the MPU 5'to turn off the switching means 21 to disconnect the write line (WR) and transfer the OK signal to the H-CPU 8 to reach the end.

Since the control device of the present invention has only the mask ROM loader built into the control MPU of the carrier drive device, new firmware can be easily rewritten to the flash ROM without increasing the number of parts or the board area. You can get what you can.

Although the flash ROM has been described as the electrically erasable and rewritable ROM in the above-described embodiments, it is obvious that it may be an EEROM or an EAROM.

[0050]

According to the control device of the present invention, the flash R
The complexity of changing the firmware of the electrically erasable and rewritable storage means such as OM is eliminated,
By incorporating the loader into the MPU for controlling the carrier driving device, it is possible to easily rewrite the electrically erasable and rewritable storage means without increasing the board area and the number of components.

[Brief description of the drawings]

FIG. 1 is a system diagram showing an embodiment of a control device of the present invention.

FIG. 2 is an overall flowchart when rewriting a flash ROM used in the control device of the present invention.

FIG. 3 is a flash RO between a host computer used for the control device of the present invention and a computer used for the controlled device.
It is a response diagram at the time of rewriting to M.

FIG. 4 is a detailed flowchart when rewriting a flash ROM used in the control device of the present invention.

FIG. 5 is a system diagram of a conventional control device.

FIG. 6 is a flowchart when rewriting a mask ROM of a conventional control device.

[Explanation of symbols]

 1 CD-ROM or CD-DA 4 CD-ROM data processor 5'MPU 5a 'flash ROM 5c mask ROM (loader) 6 interface protocol controller 8 H-CPU 10 CD-ROM drive 21 controller

Claims (2)

[Claims] 1. A control device having a microcomputer connected to a host computer for controlling an object to be controlled, comprising an electrically erasable and rewritable storage means externally or internally provided to the microcomputer, Further, the control device is provided with a non-volatile storage means for erasing and rewriting a program of the electrically erasable and rewritable storage means via the host computer in the microcomputer. 2. The control device according to claim 1, wherein the electrically erasable and rewritable storage means is a flash memory.