JPH03212865A - Optical disk controller - Google Patents

Abstract

PURPOSE:To improve reliability for readout data by storing data read out repeatedly from the same address of an optical disk medium, respectively, comparing those data, and sending only data in which coincidence is obtained to a host device. CONSTITUTION:The read circuit 10 of this optical disk controller 1 reads out the data from the optical disk medium, and demodulates it to a signal required by the host device 3, and sends it out to each of buffers 12-14. A data buffer control circuit 11 controls the input/output of the data to the buffers 12-14, and the buffers 12-14 store the data read out repeatedly for (n) times from the same address of the optical disk medium, respectively. All (n) pieces of data stored in the buffers 12-14 are compared with each other, and only the data in which the coincidence is obtained is sent out to the host device 3. In such a way, the reliability for the readout data can be improved.

Description

TECHNICAL FIELD The present invention relates to an optical disk control device, and more particularly to reliability of read data in an optical disk control device that transfers read data read from an optical disk medium to a host device.

BACKGROUND ART Conventionally, in this type of optical disk control device, data was read from an optical disk medium once, and the read data was transferred as is to a host device.

Such a conventional optical disk control device performs a data read process once on an optical disk medium and transfers the read data as it is to a host device, so there is a drawback that the reliability of the read data is low.

OBJECTS OF THE INVENTION The present invention has been made in order to eliminate the above-mentioned drawbacks of the conventional ones, and it is an object of the present invention to provide an optical disc control device that can improve the reliability of read data.

Composition of the Invention An optical disc control device according to the present invention includes a reading unit that repeatedly reads data from the same address on an optical disc medium 0 times (n is an integer of 2 or more), and a storage unit that stores n pieces of data read by the reading unit. and a first comparison means for comparing all n pieces of data stored in the storage means;
address storage means for storing the address of the read data for which a mismatch has been detected by the first comparison means; and a first address storage means for comparing the address stored in the address storage means with the address specified by the read command from the host device. 2
and a control means for controlling to suppress sending of the read data corresponding to the address where the match is detected to the host device when a match is detected by the second comparison means. It is characterized by

Embodiment Next, an embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is a professional diagram showing the configuration of an embodiment of the present invention. In the figure, an optical disk control device 1 performs data processing between an optical disk device 2 and a host device 3, and the optical disk device 2 reads and writes data to and from an optical disk medium (not shown).

A read circuit 10 of the optical disc control device 1 reads data from the optical disc medium, demodulates it into a signal required by the host device 3, and sends the signal to each buffer 12-14.

The data buffer control circuit 1] controls the input and output of data to and from the buffers 12 to 14, and under the control of the data buffer control circuit 11, each of the buffers 12 to 14 receives data repeatedly read three times from the same address on the optical disk medium. Store.

The read data transfer circuit 15 transfers the data stored in the buffer 12 to the host device 3, and the read data transfer circuit 15 transfers the data stored in the buffer 12 to the host device 3 under the control of one microprocessor. stop.

The ID reading circuit 16 reads the track number and sector number of the data sent from the buffer 12, and transfers the track number and sector number to the microprocessor 1.
Send on 9th.

The host interface circuit 17 sends and receives signals to and from the host device 3.

RAM (random access memory) 18 is buffer 1
The track number and sector number of the data in which a mismatch is detected by comparing the data stored in each of 2 to 14 are stored in a data table.

The microprocessor 19 reads data from the optical disk medium of the optical disk device 2 three times after turning on the power to the optical disk control device 1, controls the read circuit 10 and the data buffer control circuit 11, and transfers the read data to the respective buffers 12. ~14.

Further, one microprocessor compares the data stored in the buffers 12 to 14, respectively, and stores the track number and sector number of the data that do not match in the RAM 18.

Furthermore, the microprocessor 1 compares the track number and sector number stored in the RAM 8 with the track number and sector number read by the ID reading circuit 16, and transfers the read data according to the comparison result. An instruction is given to the circuit 15 as to whether or not to transfer data to the host device 3.

The device interface circuit 20 transmits and receives signals to and from the optical disc device 2.

FIGS. 2 and 3 are flowcharts showing the operation of one embodiment of the present invention. The operation of the present invention will be explained using these FIGS. 1 to 3.

When the optical disk controller 1- is powered on (step 21 in FIG. 2), the microprocessor 19 controls the optical disk drive 2 through the device interface circuit 20 to read the data recorded on the optical disk medium. Check whether the media can be read.

If the reading state of the optical disk medium is acceptable, the microprocessor 19 issues a command to read data from the optical disk medium to the optical disk device 2 through the device interface circuit 20.

The optical disk device 2 sequentially sends the data read from the top of the optical disk medium to the read circuit 1o (step 2 in FIG. 2).
2).

When all data read from the optical disk medium has been sent, the microprocessor 19 issues a command to store the data to the data huffer control circuit 11 (step 23 in FIG. 2).

Data buffer control circuit 1] is a microprocessor 19
Since a write command is output to the buffer 12 according to the command from the read circuit 10, the data from the read circuit 10 is stored in the buffer 2 (step 24 in FIG. 2).

When all the data from the read circuit 10 is stored in the buffer] 2, the microprocessor 1 issues a command to the optical disc device 2 again to read data from the optical disc medium, and the data is stored in the buffer 13 in the same manner as the above processing operation. The data is stored, and the same sequence as above is repeated again, and finally the data is stored in the buffer 14 (
Figure 2 Steps 25 and 26).

Next, when no command comes from the host device 3, the microprocessor 19 first takes in the data at the first track number and first sector number stored in the buffer 1.2.13 and compares them. (Step 27 in Figure 2).

When a match is detected through this comparison (step 28 in FIG. 2), the microprocessor 19 reads the track number and sector number of the last data stored in the buffer 2 via the ID reading circuit 16, and reads the track number and sector number of the last data stored in the buffer 2, The data is compared with the track number and sector number of the data detected to match, and if they match, the operation is terminated (steps 35 and 36 in FIG. 2).

If the track numbers and sector numbers do not match (step 36 in FIG. 2), the microprocessor 1
9 takes in the data of the sector number next to the compared data from the buffers 12 and 13, respectively (step 3 in Figure 2).
7), compare these data (step 27 in Figure 2).
).

Furthermore, if the data of the same track number and sector number in the buffer 12.13 do not match (step 28 in FIG. 2), one microprocessor takes in the data of the same track number and sector number from the buffer 14. Then, compare those data (Step 29 in Figure 2).
.

If the data from buffers 12 and 14 match (step 30 in FIG. 2), microprocessor 19 calculates the track number and sector number of the last data stored in buffer 12 in the same manner as described above. is read through the ID reading circuit 16 and compared with the track number and sector number of the pig for which a match was detected in the above comparison. If they match, the operation is terminated. Step 35 in FIG.
．． 36), if they do not match (step 36 in Figure 2), the data of the sector number next to the compared data is transferred to buffer 1.
2.13 (Step 37 in Figure 2) and continue comparing these data (Steps 27 to 3 in Figure 2).
0.35-37).

If the data from buffer 12.14 is inconsistent (second
Step 30 in Figure 2), creates a data table with the track number and sector number of the data, and stores the data table in RAM 1.8 (Step 31 in Figure
-).

When the track number and sector number of the data for which a mismatch has been detected are stored in the RAM 18, the microprocessor 1
9 compares the track number and sector number of the last data stored in the buffer 12 with the track number and sector number of the data for which a mismatch has been detected by the above comparison, and if the comparison is successful, the operation is terminated. If the track number and sector number do not match (Step 33 in Figure 2), the data of the sector number next to the compared data is fetched from the buffers 12 and 13 respectively (Step 3233 in Figure 2). (Step 34 in FIG. 2), and the comparison of these data continues (Steps 27 to 37 in FIG. 2).

When receiving a read command from the host device 3 via the host interface circuit 17, the microprocessor 19 issues a read command to the data buffer control circuit 11 to sequentially send out the data in the bath sofa 12 (step 41 in FIG. 3).

Since the data buffer control circuit 11 puts the buffer 12 in a read state, the data at the address specified by the read command from the host device 3 is read from the buffer 12 and transferred to the read data transfer circuit 15 (step 3 in FIG. 42).

At this time, the track number and sector number of the data sent from the buffer 12 are read by the ID reading circuit 16 (step 43 in FIG. 3), so the microprocessor 19 reads the track number and sector number and the RAM
The track number and sector number stored in 18 are compared (step 44 in FIG. 3).

If there is a discrepancy in the comparison result (Step 45 in Figure 3)
, the microprocessor one issues a transfer command to the read pig transfer circuit 15 to transfer the data from the buffer 12 to the host device 3.

When the read data transfer circuit 15 receives a transfer command from the microprocessor 19, it transfers the data from the buffer 12 to the host device 3 (step 46 in FIG. 3).

When the data transfer to the host device 3 is completed, the microprocessor 1 reads the track number and sector number of the last data stored in the buffer 12 via the ID reading circuit 16, and detects a mismatch by the above comparison. Compare the track number and sector number of the recorded data,
If they match, all operations are completed (steps 47 and 48 in FIG. 3).

If the track numbers and sector numbers do not match (step 48 in FIG. 3), the microprocessor 1
Reference numeral 9 indicates the track number and sector number read by the ID reading circuit 16 when the data at the next address specified by the read command from the host device 3 is read from the buffer 12 and transferred to the read data transfer circuit 15. and,
Comparison is made with the track number and sector number stored in RAM] 8 (Steps 49 and 44 in Figure 3).
.

Further, if the comparison results between the track number and sector number read by the ID reading circuit 16 and the track number and sector number stored in the RAM 18 match (step 45 in FIG. 3), the contents of the data in the buffer 12 and the contents of the data in buffers 13 and 14 are different, so
The microprocessor 19 issues an inhibit command to the read data transfer circuit 15 so as not to transfer the data to the host device 3 (step 50 in FIG. 3).

The read data transfer circuit 15 that receives the inhibit command from one microprocessor does not transfer the data to the host device 3.

Next, one microprocessor reads the track number and sector number of the last data stored in the buffer 12 via the ID reading circuit 16, and reads the track number and sector number of the last data stored in the buffer 12 and the data that was not transferred to the host device 3. Compare the track number and sector number, and if they match, complete the operation (Step 5 in Figure 3).
1,52).

If the track numbers and sector numbers do not match (step 52 in FIG. 3), one microprocessor reads the data at the next address specified by the read command from the host device 3 from the buffer 12. When the data is transferred to the read data transfer circuit 15, the track number and sector number read by the ID reading circuit 16 are compared with the track number and sector number stored in the RAM 18 (steps in FIG. 3). 53.4
4).

In this way, n times (
n is an integer of 2 or more) The n pieces of data that have been repeatedly read out are stored in buffers 12 to 14, respectively, and
The reliability of read data can be improved by comparing all n pieces of data stored in 14 and sending only data for which a match is detected to host device 3.

In one embodiment of the present invention, the same address on the optical disk medium is repeatedly read three times;
It may be twice or four times, but is not limited to these.

DETAILED DESCRIPTION OF THE INVENTION According to the present invention, n pieces of data repeatedly read out n times (n is an integer of 2 or more) from the same address on an optical disk medium are stored respectively, and the stored n pieces of data are stored. By comparing all the data and sending only the data for which a match has been detected to the host device, the reliability of the read data can be improved.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing the configuration of an embodiment of the invention, and FIGS. 2 and 3 are flowcharts showing the operation of the embodiment of the invention. Explanation of symbols of main parts 1 ... Optical disk control device 2 ... Optical disk device 3 ... Host device 10 ... Read circuit 11 ... Data buffer control circuit 2-14...
...Buffer 15...Read data transfer circuit 16...I
D reading circuit 18...One RAM...Microprocessor

Claims (1)

[Claims] (1) n times from the same address on the optical disk medium (n is 2
(an integer greater than or equal to)) a reading means for repeatedly reading data, a storage means for storing n pieces of data read by the reading means, and a first comparison means for comparing all the n pieces of data stored in the storage means. , address storage means for storing the address of the read data for which a mismatch has been detected by the first comparison means, and the address stored in the address storage means is compared with the address specified by the read command from the host device. a second comparing means; and a control means configured to control, when a match is detected by the second comparing means, to suppress sending of read data corresponding to the address where the match is detected to the host device. An optical disc control device characterized by: