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Table 114 Command Format
Bit
47
46
[45:40]
[39:8]
[7:1]
0
Width
1
1
6
32
7
1
Numerical Value
0
1
-
-
-
1
Description
Start Bit
Transmission Bit Command Index Parameter CRC7
End bit
SD I/O supports two types of response, both of which support CRC error
detection.
48-bit short response
136-bit long response
Table 115 Short Response Format
Bit
47
46
[45:40]
[39:8]
[7:1]
0
Width
1
1
6
32
7
1
Numerical
Value
0
0
-
-
-
1
Description
Start
Bit
Transmission
Bit
Command
Index
Paramet
er
CRC7 or
(1111111)
End
bit
Table 116 Long Response Format
Bit
135
134
[133:128]
[127:1]
0
Width
1
1
6
127
1
Numerical Value
0
0
111111
-
1
Description
Start Bit
Transmission Bit
Reserved
CID or CSD
End bit
Command description
Table 117 Basic Command
Command
Index
Type
Parameter
Response
format
Short
name
Description
CMD0
bc
[31:0]
Stuffing bit
-
GO_IDLE_
STATE
Reset all cards to the
idle state.
CMD1
bc
[31:0]OCR
R3
SEND_OP_
COND
In the idle state, request
the card to transmit the
response (including the
content of the operating
condition register)
through the CMD line
CMD2
bcr
[31:0]
Stuffing bit
R2
ALL_SEND
_CID
Request any card to
transmit CID data
through the CMD line
(all cards connected to
the master will respond)