cmd
dat0
Command
Response
Command
Response
Block write operation
Host to
card
Card to
host
Host to
card
dat[3:1]
Card to
host
Data block
+ CRC
Busy
CRC
Status
XX
Host to
card
Card to
host
mmchs-057
Data block
+ CRC
XXXX
t1
t2
cmd
dat0
Command
Response
Block write operation
Host to
card
Card to
host
Host to
card
dat[3:1]*
(see note 1)
Card to
host
Data block
+ CRC
Busy
CRC
Status
XX
mmchs-058
Data block
+ CRC
XXXX
t1 t2
Public Version
www.ti.com
MMC/SD/SDIO Functional Description
Figure 24-24. Busy Timeout After Write CRC Status
t1 - Data timeout counter is loaded and starts after CRC Status
t2 - Data timeout counter stops and if it is 0,
[21] DCRC is generated.
24.4.5.3 Write CRC Status Timeout
shows DCRC event condition asserted when there is write CRC status timeout.
Figure 24-25. Write CRC Status Timeout
t1 - Data timeout counter is loaded and starts after Data block + CRC
t2 - Data timeout counter stops and if it is 0,
[21] DCRC is generated.
24.4.5.4 Read Data Timeout
shows DCRC event condition asserted when there is read data timeout.
3391
SWPU177N – December 2009 – Revised November 2010
MMC/SD/SDIO Card Interface
Copyright © 2009–2010, Texas Instruments Incorporated