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Section 23 CD-ROM Decoder
Page 1246 of 2108 R01UH0134EJ0400 Rev. 4.00
Sep 24, 2014
SH7262 Group, SH7264 Group
(3) Interpolated Sync Mode
In interpolated sync mode, synchronization is always driven by the internal counter after a sync
code pattern has been detected at the start of decoding. Accordingly, this mode is effective when
the sync patterns have been damaged.
However, decoding becomes incorrect after a change to the synchronization timing, since the
change in timing is not followed.
Figure 23.12 shows the operation in interpolated sync mode.
Abnormal
sector
Abnormal
sector
Abnormal
sector
Abnormal
sector
Sector 1
Input data
Sync code
detection
Output data
Sector 1 Sector 3 Sector 4 Sector 5
Abnormal sector
MaintainMaintainMaintainMaintain Ignore Ignore Ignore
Figure 23.12 Operation in Interpolated Sync Mode