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Card Identification and Card Operation Conditions Timing—The card identification (CMD2) and card
operation conditions (CMD1) timing are processed in the open-drain mode. The card response to the host
command starts after exactly N
<---- Host Command ---->
CMD
S T
Content
Figure 5-7 Identification Timing (Card Identification Mode)
Last Card Response - Next Host Command Timing—After receiving the last card response, the host can
start the next command transmission after at least N
command.
<-------- Response -------->
CMD
S T
Content
Figure 5-8 Timing Response End to Next CMD Start (Data Transfer Mode)
Last Host Command - Next Host Command Timing Diagram—After the last command has been sent,
the host can continue sending the next command after at least N
for any host command that does not have a response.
<----- Host Command ---->
CMD
S T
Content
Figure 5-9 Timing CMD
In the case the CMD
n
the next CMD
command is allowed to follow after at least N
n+1
clock periods.
5.10.2 Data Read
Single Block Read—The host selects one card for data read operation by CMD7, and sets the valid
block length for block oriented data transfer by CMD16. The basic bus timing for a read operation is
given in Figure 5-10. The sequence starts with a single block read command (CMD17) which specifies
the start address in the argument field. The response is sent on the CMD line as usual.
SanDisk MultiMediaCard Product Manual Rev. 2 © 2000 SANDISK CORPORATION
clock cycles.
ID
<-N
Cycles->
ID
CRC
E Z
* * * * * *
<-N
Cycles ->
RC
CRC
E Z
* * * * * *
<-N
Cycles ->
CC
CRC
E Z
* * * * * *
command was a last acquisition command no more responded by any card, than
MultiMediaCard Product Manual
<---- CID or OCR --->
Z S T
Content
clock cycles. This timing is relevant for any host
RC
<---- Host Command ----->
Z S T
Content
clock periods. This timing is relevant
CC
<---- Host Command ----->
Z S T
Content
End to CMD
Start (All Modes)
n
n+1
+136 (the length of the R2 response)
CC
Z Z Z
CRC E
CRC E
57
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