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Section 23 CD-ROM Decoder
Page 1192 of 2108 R01UH0134EJ0400 Rev. 4.00
Sep 24, 2014
SH7262 Group, SH7264 Group
Data buffering control
The CD-ROM decoder outputs data to the buffer area in a specific format where the sync code
is at the head of the data for each sector.
23.1.1 Formats Supported by CD-ROM Decoder
This module supports the five formats shown in figure 23.1.
Sync
(12 bytes)
Header
(4 bytes)
Sync
(12 bytes)
Header
(4 bytes)
Sync
(12 bytes)
Header
(4 bytes)
Sync
(12 bytes)
Header
(4 bytes)
Sync
(12 bytes)
Header
(4 bytes)
Sub-header
(8 bytes)
Sub-header
(8 bytes)
Q-parity
(104 bytes)
P-parity
(172 bytes)
0
(8 bytes)
EDC
(4 bytes)
Q-parity
(104 bytes)
P-parity
(172 bytes)
EDC
(4 bytes)
EDC
(4 bytes)
Mode1
Mode2
(not XA)
Mode2
Form1
Mode2
Form2
Mode0 All 0
Data (2048 bytes)
Data (2336 bytes)
Data (2048 bytes)
Data (2324 bytes)
Figure 23.1 Formats Supported by CD-ROM Decoder