KR100188685B1 - Hard ware examination method of compact disc driver - Google Patents

Abstract

The present invention relates to a hardware inspection method of a compact disk drive, comprising: a first step of inputting inspection command data by a predetermined input means; Converting the input command data into serial data; A third step of inputting the serial data into a digital signal processor (DSP) and a servo signal processor (SSP); And a fourth step of inspecting operating states of the digital signal processor DSP and the servo signal processor SSP. With the features including the above, the functions of the digital signal processor (DSP) and the servo signal processor (SSP) can be examined without using a microcomputer, thereby increasing the accuracy of the inspection.

Description

How to Check the Hardware of a Compact Disk Drive

1 is an exemplary view for explaining a conventional hardware inspection method.

2 is an exemplary view for explaining a hardware inspection method according to the present invention.

3 is an internal block diagram of the command signal generation kit of FIG.

4 is a table illustrating the command data of FIG.

* Explanation of symbols for main parts of the drawings

201: Command Signal Generation Kit 202: Digital Signal Processor

203: servo signal processor 204: instrument

301: keypad 302: input latch

303: ram 304: output latch

305: input and output control unit 306: display encoder

307: display 308: parallel / serial converter

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hardware inspection method of a compact disk drive. Specifically, a digital signal processor and a servo signal processor used in a compact disk drive are described. It is about how to check the function.

A typical compact disk drive is roughly classified into a microcomputer, a digital signal processor (DSP), a servo signal processor (SSP), a driving part, and an interface. The interrelationship between them is as follows. That is, the microcomputer executes a command of a corresponding PC (Presonal Computer) through an interface, and the digital signal processor (DSP) and the servo signal processor (SSP) control the driver while executing the command of the microcomputer. In order to examine the functions of the digital signal processor (DSP) and the servo signal processor (SSP), which are the core elements of such a compact disk drive, the conventional method of directly using the microcomputer has been selected.

1 is an exemplary diagram for explaining a conventional hardware test method. In order to check the functions of the digital signal processor 102 and the servo processor 103 used in the compact disk drive as shown, conventionally, command signals are inputted by the microcomputer 101 used in the compact disk drive. It was made. Since a predetermined control program is built in the microcomputer 101, the command signal output from the microcomputer 101 is generated by firmware in which software and hardware are fused. In a typical compact disc drive, the signals generated from the microcomputer 101 are three signals: serial data DATA, clock, and latch XLAT. The clock signal indicates a byte boundary of the serial data signal, and the latch signal XLAT indicates a word boundary of the serial data signal. By these three signals, a command signal for controlling the digital signal processor 102 and the servo signal processor 103 is input. As shown in FIG. 1, such a command signal is input to the digital signal processor 102 and the servo signal processor 103, and the respective output states are measured by the measuring instrument 104, thereby providing various servo control and playback functions. Etc. can be checked. Meanwhile, instead of using the measuring instrument 104, the actual driving unit may be connected and inspected.

The conventional hardware inspection method as described above has a problem in that an accurate inspection cannot be performed when there is an error in the driving servo firmware of the microcomputer 101 by using the corresponding microcomputer 101.

The present invention was devised to improve the above problems, and the hardware inspection of the compact disk drive, which can test the functions of the digital signal processor (DSP) and the servo signal processor (SSP) without using a microcomputer. The purpose is to provide a method.

In order to achieve the above object, a hardware inspection method of a compact disc drive according to the present invention,

A first step of inputting inspection command data as predetermined input means;

Converting the input command data into serial data;

A third step of inputting the serial data to a digital signal processor (DSP) and a servo signal processor (SSP); And

A fourth step of inspecting operating states of the digital signal processor (DSP) and the signal processor (SSP); It characterized by including.

Hereinafter, exemplary embodiments of the present invention will be described with reference to the accompanying drawings.

2 is an illustration for explaining a hardware inspection method according to the present invention. In order to check the functions of the digital signal processor 202 and the servo signal processor 203 used in the compact disc drive as shown, a separate command signal generation kit 201 is used in the present invention. The command signal generation kit 201 includes: a keypad for inputting command data by an inspector; A random access memory (RAM) for sequentially storing and outputting input command data; A display unit for monitoring command data from the RAM; A parallel to serial converter for converting command data from the RAM into serial data; Etc. are provided. Accordingly, three signals of the serial data DATA, the clock CLOCK, and the latch XLAT generated from the command signal generation kit 201 are input to the digital signal processor 202 and the servo signal processor 203. By grasping each output state with the measuring instrument 204, various servo control and playback functions can be inspected. Meanwhile, instead of using the measuring instrument 204, the actual driving unit may be connected and inspected.

3 is an internal block diagram of the command signal generation kit of FIG. As shown, the command signal generation kit (201 in FIG. 2) according to the present invention includes: a keypad (Key pad) 301 for inputting command data by an inspector; An input latch 302 for temporarily storing input command data; A random access memory (RAM) for sequentially storing and outputting command data from the input latch 302; An output latch 304 for temporarily storing command data from the RAM 303; An input / output controller 305 for controlling an input / output point of time of the RAM 303 according to an input / output control signal generated by the keypad 302; A display encoder (306) for generating a display signal according to the command data from the output latch (304); A display (307) for displaying command data from the output latch (304) in accordance with the display signal; And a parallel to serial converter (308) for converting the command data from the output latch 304 into serial data. Equipped with.

4 is a table illustrating the command data of FIG. When such hexadecimal command data is inputted to the keypad (301 in FIG. 3), the command data is input latch (302 in FIG. 3), RAM (303 in FIG. 3), output latch (304 in FIG. 3), and It is input to the digital signal processor (202 in FIG. 2) and the servo signal processor (203 in FIG. 2) through the parallel / serial converter 308. Accordingly, by measuring the output states of the digital signal processor (202 in FIG. 2) and the servo signal processor (203 in FIG. 2) with the measuring instrument (204 in FIG. 2), various servo control and regeneration functions can be inspected. have. On the other hand, instead of using a measuring instrument (204 in Fig. 2), it is also possible to test by connecting the actual drive. For example, to check the reproducing functions of the digital signal processor (202 in FIG. 2) and the servo signal processor (203 in FIG. 2), input the command data of FIG. 4 in the following order to confirm the driving state. . That is, while inputting command data to the keypad (301 in FIG. 3) in the order of 00 (H)-02 (H)-03 (H)-08 (H)-E8 (H)-E6 (H), You can check the driving status. Here, as command data input to the digital signal processor (202 of FIG. 2) and the servo signal processor (203 of FIG. 2) is displayed on the display (307 of FIG. 3), the inspector determines whether the command data is correctly input. You can check it.

The present invention is not limited to the above embodiment, and its use and improvement are possible at the level of those skilled in the art.

As described above, according to the hardware inspection method of the compact disc drive according to the present invention, the functions of the digital signal processor (DSP) and the servo signal processor (DSP) can be inspected without using a microcomputer. The accuracy of the test can be improved.

Claims (3)

A first step of inputting inspection command data as predetermined input means; A second step of converting the input command data into serial data; A third step of inputting the serial data into a digital signal processor (DSP) and a servo signal processor (SSP); And a fourth step of inspecting operating states of the digital signal processor DSP and the servo signal processor SSP. Hardware inspection method for a compact disk drive, characterized in that it comprises a. The method of claim 1, wherein the first and second steps are performed by a predetermined command signal generation kit. The apparatus of claim 2, wherein the command signal generation kit comprises: a keypad for inputting command data by an inspector; An input latch for temporarily storing the input command data; RAM for sequentially storing and outputting command data from the input hatch; An output latch for temporarily storing command data from the RAM; An input / output control unit controlling an input / output time point of the RAM according to an input / output control signal generated from the keypad; A display encoder for generating a display signal according to the command data from the output latch; A display for displaying command data from the output latch in accordance with the display signal; And a parallel / serial converter for converting the command data from the output latch into serial data.