Renesas R5S72621 User Manual

 
Section 23   CD-ROM Decoder 

Page 1212 of 2108 

 

R01UH0134EJ0400  Rev. 4.00 

 

 Sep 

24, 

2014 

SH7262 Group, SH7264 Group

The header/subheader validity check status register (CROMST4) indicates errors relating to the 
automatic mode determination or form determination for Mode 2. 

7

6

5

4

3

2

1

0

0

0

0

0

0

0

0

0

R

R

R

R

R

R

R

R

Bit:

Initial value:

R/W:

NG_MD

NG_ 

MDCMP1

NG_ 

MDCMP2

NG_ 

MDCMP3

NG_ 

MDCMP4

NG_

MDDEF

NG_ 

MDTIM1

NG_ 

MDTIM2

 

 

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.