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Section 23 CD-ROM Decoder
R01UH0134EJ0400 Rev. 4.00 Page 1213 of 2108
Sep 24, 2014
SH7262 Group, SH7264 Group
23.3.12 Mode Determination and Link Sector Detection Status Register (CROMST5)
The mode determination and link sector detection status register (CROMST5) indicates the result
of automatic mode determination and link block detection.
76543210
00000000
RRRRRRRR
ST_AMD[2:0] ST_MDX LINK_ON
LINK_
DET
LINK_
SDET
LINK_
OUT1
Bit:
Initial value:
R/W:
Bit Bit Name
Initial
Value R/W Description
7 to 5 ST_AMD
[2:0]
000 R Result of Automatic Mode Determination
These bits indicate the result of mode determination
when the automatic mode determination function is
used.
000: Automatic mode determination function is not used
001: Mode 0
010: Mode 1
011:
100: Mode 2 not XA
101: Mode 2 Form 1
110: Mode 2 Form 2
111:
4 ST_MDX 0 R Indicates that, when the mode has been manually set
rather than automatically determined, the mode setting
disagrees with the mode as recognized by the logic. In
this case, the manually set value takes priority.
3 LINK_ON 0 R This bit is set to 1 when a link block was recognized in
link block determination.
For the criteria for link block determination, refer to the
LINK2 bit in the CROMCTL4 register.
2 LINK_DET 0 R Indicates that a link block (run-out 1 to run-in 4) was
detected.
Since detection is based on the data before ECC
correction, LINK_DET may also be set to 1 if data
erroneously happens to contain the same code as a link
block.