Specifications

©Copyright 2001-2013 SD Group (Panasonic, SanDisk, Toshiba) and SD Card Association
Physical Layer Simplified Specification Version 4.10
82
4.9.6 R7 (Card interface condition)
Code length is 48 bits. The card supported voltage information of 3.3V range power pin is sent by the
response of CMD8. Bits 19-16 indicate the voltage range that the card supports. The card that accepted
the supplied voltage returns R7 response. In the response, the card echoes back both the voltage
range and check pattern set in the argument.
Table 4-39: Response R7
Table 4-40 shows the format of 'voltage accepted' in R7.
Voltage accepted
Value Definition
0000b
Not Defined
0001b
2.7-3.6V
0010b
Reserved for Low Voltage Range
0100b
Reserved
1000b
Reserved
Others
Not Defined
Table 4-40: Voltage Accepted in R7
Bit position
47
46
[45:40]
[39:20]
[19:16]
[15:8]
[7:1]
0
Width (bits)
1
1
6
20
4
8
7
1
Value
'0'
'0'
'001000'
'00000h'
x
x
x
'1'
Description
Start
bit
Transmission
bit
Command
index
Reserved
bits
Voltage
accepted
Echo-back
of check
pattern
CRC
7
E
nd
bit