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Section 23 CD-ROM Decoder
Page 1212 of 2108 R01UH0134EJ0400 Rev. 4.00
Sep 24, 2014
SH7262 Group, SH7264 Group
23.3.11 Header/Subheader Validity Check Status Register (CROMST4)
The header/subheader validity check status register (CROMST4) indicates errors relating to the
automatic mode determination or form determination for Mode 2.
76543210
00000000
RRRRRRRR
Bit:
Initial value:
R/W:
NG_MD
NG_
MDCMP1
NG_
MDCMP2
NG_
MDCMP3
NG_
MDCMP4
NG_
MDDEF
NG_
MDTIM1
NG_
MDTIM2
Bit Bit Name
Initial
Value R/W Description
7 NG_MD 0 R Indicates that the sector mode could not be determined
according to the automatic mode determination criteria.
6 NG_
MDCMP1
0 R Indicates a mismatch between the file number bytes
(bytes 16 and 20) during the form determination for
Mode 2.
5 NG_
MDCMP2
0 R Indicates a mismatch between the channel number
bytes (bytes 17 and 21) during the form determination
for Mode 2.
4 NG_
MDCMP3
0 R Indicates a mismatch between the sub-mode bytes
(bytes 18 and 22) during the form determination for
Mode 2.
3 NG_
MDCMP4
0 R Indicates a mismatch between the data-type bytes
(bytes 19 and 23) during the form determination for
Mode 2.
2 NG_
MDDEF
0 R Indicates that the mode and form differ from those of
the previous sector.
1 NG_
MDTIM1
0 R Indicates that the minutes, seconds, or frames (1/75
second) value is out of sequence.
In the continuity check for the next and subsequent
sectors, the updated values will be used.
0 NG_
MDTIM2
0 R Indicates that the minutes, seconds, or frames (1/75
second) value was not a BCD value.
Specifically, this bit means that any half-byte was
beyond the range for BCD (i.e. was A to F), HEAD01
was greater than H’59, or HEAD02 was greater than
H'74.
In the continuity check for the next and subsequent
sectors, interpolated values will be used.