cmd
dat0
Command
Response
Command
Response
Host to
card
Card to
host
dat[3:1]
Host to
card
Card to
host
mmchs-056
t1
t2
Busy
XXXX
Public Version
MMC/SD/SDIO Functional Description
www.ti.com
Table 24-6. CC and TC Values Upon Error Detected (continued)
Error hold in the MMCi.
CC
TC
Comments
register
17
CCRC
1
CC can be set upon CCRC - See CTO comment
16
CTO
CTO and CC are mutually exclusive.
CIE, CEB and CERR cannot occur with CTO.
CTO can occur at the same time as CCRC: it indicates a
command abort due to a contention on CMD line. In this case no
CC appears.
[21] DCRC event can be asserted in the following conditions:
•
busy timeout for R1b, R5b response type
•
busy timeout after write CRC status
•
write CRC status timeout
•
read data timeout
•
boot acknowledge timeout
24.4.5.1 Busy Timeout For R1b, R5b Response Type
shows DCRC event condition asserted when there is busy timeout for Rb1, R5b response.
Figure 24-23. Busy Timout for R1b, R5b Response Type
t1 - Data timeout counter is loaded and starts after R1b, R5b response type
t2 - Data timeout counter stops and if it is 0,
[21] DCRC is generated.
24.4.5.2 Busy Timeout After Write CRC Status
shows DCRC event condition asserted when there is busy timeout after write CRC status.
3390
MMC/SD/SDIO Card Interface
SWPU177N – December 2009 – Revised November 2010
Copyright © 2009–2010, Texas Instruments Incorporated