SH7261 datasheet(1029/1348 Pages) RENESAS

1029 / 1348 page

Section 21 CD-ROM Decoder (ROM-DEC)

Rev. 2.00 Sep. 07, 2007 Page 997 of 1312

REJ09B0320-0200

Intput data

Sync code

detection

Output data

Sector 1

Abnormal sector

Abnormal

sector

Maintain

Ignore

Maintain

Re-synchronization

Abnormal

sector

Sector 1

Sector 4

Sector 3

Sector 4

Sector 5

Figure 21.10 Operation in Automatic Sync Maintenance Mode

(When an Abnormally Long Sector is Encountered)

(2)

External Sync Mode

In external sync mode, synchronization is always based on the sync codes in the incoming data.

Even if the next sync code is not detected at the 2352nd byte, decoding does not proceed until the

next sync code is detected.

Accordingly, this mode is effective in that it strictly follows the external synchronization timing.

Note, however, that decoding will not be performed normally when the sync-code pattern is input

with abnormal timing.

Figure 21.11 shows the operation in external sync mode.

Abnormal

sector

Sector 1

Sector 3

Sector 4

Intput data

Sync code

detection

Output data

Sector 1

Sector 3

Sector 4

Sector 5

Abnormal sector

Figure 21.11 Operation in External Sync Mode

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