Product manual

4-26 SanDisk miniSD Card Product Manual, Rev. 1.1 © 2003 SANDISK CORPORATION
There are four types of responses that are supported in the SanDisk miniSD Card. Their formats are defined as
follows:
R1 (standard response): response length 48 bit.
Bits 45:40 indicate the index of the command to which it is responding. The status of the card is coded in 32 bits.
Note that when a data transfer to the card is involved, a busy signal may appear on the data line after the
transmission of each block of data. The host will check for busy after the data block transmission.
Table 4-23. Response R1
Bit Position 47 46 [45:40] [39:8] [7:1] 0
Width (bits) 1 1 6 32 7 1
Value ‘0’ ‘0’ x x x ‘1’
Description start bit transmission bit command index card status CRC7 end bit
R1b is identical to R1 with an optional busy signal transmitted on the data line. The card may become busy after
receiving these commands based on its state prior to the command reception. The host will check for busy at the
response.
R2 (CID, CSD register): response length 136 bits.
The content of the CID register is sent as a response to CMD2 and CMD10. The content of the CSD register is sent
as a response to CMD9. The only bits transferred are [127...1] of the CID and CSD, bit [0] of these registers is
replaced by the end bit of the response.
Table 4-25. Response R2
Bit Position 135 134 [133:128] [127:1] 0
Width (bits) 1 1 6 127 1
Value ‘0’ ‘0’ ‘111111’ x ‘1’
Description start bit transmission bit reserved CID or CSD register incl.
internal CRC7
end bit
R3 (OCR register): response length 48 bits.
The contents of the OCR register are sent as a response to ACMD41.
Table 4-27. Response R3
Bit Position 47 46 [45:40] [39:8] [7:1] 0
Width (bits) 1 1 6 32 7 1
Value ‘0’ ‘0’ ‘111111’ x ‘1111111’ ‘1’
Description start bit transmission bit reserved OCR register reserved end bit