The Relation Between Command Crc Error And Command Timeout Error - Samsung S3C2416 User Manual

HSMMC CONTROLLER
The relation between Auto CMD12 CRC Error and Auto CMD12 Timeout Error is shown below.
Table 21-5. The Relation Between Command CRC Error and Command Timeout Error
Auto CMD12 CRC Error
0
0
1
1
The timing of changing Auto CMD12 Error Status can be classified in three scenarios:
(1) When the Host Controller is going to issue Auto CMD12
Set D00 to 1 if Auto CMD12 cannot be issued due to an error in the previous command.
Set D00 to 0 if Auto CMD12 is issued.
(2) At the end bit of an Auto CMD12 response
Check received responses by checking the error bits D01, D02, D03 and D04.
Set to 1 if error is detected.
Set to 0 if error is not detected.
(3) Before reading the Auto CMD12 Error Status bit D07
Set D07 to 1 if there is a command cannot be issued
Set D07 to 0 if there is no command to issue
Timing of generating the Auto CMD12 Error and writing to the Command register are asynchronous. Then D07
shall be sampled when driver never writing to the Command register. So just before reading the Auto CMD12
Error Status register is good timing to set the D07 status bit. An Auto CMD12 Error Interrupt is generated when
one of the error bits D00 to D04 is set to 1. The Command Not Issued By Auto CMD12 Error does not generate
an interrupt.
20-60
Auto CMD12 Timeout Error
0
1
0
1
S3C2416X RISC MICROPROCESSOR
Kinds of error
No Error
Response Timeout Error
Response CRC Error
CMD line conflict