SanDisk SDSDH-1024 Product Manual - Page 108

Reading the CSD Register

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Revision 2.2 Chapter 5 - SPI Protocol SD Card Product Manual Host Command to Card Response-Card is Busy CS Data In Data Out HL L L L L L L HHHLL L L L L HH NCS XHHHH 6 byte cmd Z Z H H H H ******** NEC NDS NEC HHHHHHHHHHHHH X X X HH HHHHX X NCR H H H H Card resp. Busy L Z Z Z Busy H H H H Z Card Response to Host Command CS L L L L L Data In Data Out H H H H H H H H H H H 1 or 2 byte resp. HHHH NCR HHHH 6-byte command L L HHHH HHHX X X X HHHHZ Z Z 5.23.3 Data Read The following timing diagram describes all single block read operations with the exception of SEND_CSD command. Single Block Read Timing CS Data In Data Out HL L L NCS X H H H H Read Command H H H H H Z Z H H H H ******** NCR H H H H Card resp. NAC H H H H Data Block L L L HHHH NEC HHHXXXX HHHHZ Z Z The following figure describes a Stop Transmission operation in case Multiple Block Read occurs. Multiple Block Read Timing CS L L L L NCS Data In X H H H H stop tran cmd H H H H H NCR Data Out data transfer to host HH card response H Reading the CSD Register The following timing diagram describes the SEND_CSD command bus transaction. The timeout values for the response and the data block are NCR (because the NAC is still unknown). Reading the CSD Register CS Data In HL L L NCS XHHHH read command Data Out Z Z H H H H ********** HHHHH NCR NCX H H H H card response H H H H data blk LL L HHHH NEC HHHX X X X HHHHZ Z Z © 2004 SanDisk Corporation 5-18 12/08/04

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Chapter 5 – SPI Protocol
Revision 2.2
SD Card Product Manual
© 2004 SanDisk Corporation
5-18
12/08/04
Host Command to Card Response—Card is Busy
Card Response to Host Command
5.23.3
Data Read
The following timing diagram describes all single block read operations with the exception
of SEND_CSD command.
Single Block Read Timing
The following figure describes a Stop Transmission operation in case Multiple Block Read
occurs.
Multiple Block Read Timing
Reading the CSD Register
The following timing diagram describes the SEND_CSD command bus transaction. The
timeout values for the response and the data block are N
CR
(because the N
AC
is still
unknown).
Reading the CSD Register
X
H
H
H
Z
Z
H
H
H
H
L
L
*******************
6 byte cmd
H
H
H
H
H
H
H
H
********
H
H
X
X
X
H
H
Card resp.
L
Z
Z
Z
H
L
L
L
L
L
H
H
N
CS
N
EC
N
CR
CS
Data In
Data Out
L
L
L
H
H
H
L
L
H
H
H
H
H
H
H
H
H
Busy
Busy
H
H
H
X
X
H
H
H
H
Z
L
N
DS
N
EC
H
H
H
H
H
H
H
H
L
L
L
*******************
****************
H
H
H
1 or 2 byte resp.
*********************
H
H
H
L
H
H
H
H
N
CR
CS
Data In
Data Out
L
H
H
H
X
X
X
X
H
H
Z
Z
Z
L
H
6-byte command
H
H
H
H
H
H
L
X
H
H
H
Z
Z
H
H
H
H
L
L
***************************************
Read Command
H
H
H
H
H
H
H
H
********
H
Card resp.
H
H
H
L
L
L
H
H
H
H
N
CS
N
CR
CS
Data In
Data Out
L
H
H
H
H
X
X
X
X
H
H
Z
Z
Z
N
EC
***********************
Data Block
H
H
H
H
N
AC
X
H
H
H
H
L
L
L
*******************
stop tran cmd
H
H
H
H
H
***************
data transfer to host
card response
H
N
CS
N
CR
CS
Data In
Data Out
L
H
H
<2clk>
X
H
H
H
Z
Z
H
H
H
L
L
*******************
read command
**********
card response
H
H
H
L
H
H
H
H
N
CR
CS
Data In
Data Out
L
H
H
X
X
X
X
H
H
Z
Z
Z
L
*********************
H
H
H
H
H
H
L
H
H
H
H
H
H
H
H
H
data blk
H
N
CS
N
CX
N
EC