Specifications

©Copyright 2001-2013 SD Group (Panasonic, SanDisk, Toshiba) and SD Card Association
Physical Layer Simplified Specification Version 4.10
28
Figure 4-2: Card Initialization and Identification Flow (SD mode)
ACMD41
with HCS=0
No response
Power-
on
CMD
0
CMD
8
Non-
compatible voltage range
or check pattern is not correct
Compatible voltage range
and check pattern is correct
ACMD41
with HCS=0or1
Card returns response
Valid
Response
?
Card is
ready?
Card returns
busy
cards with non compatible voltage range
or time-out (
no response or busy) occurs
Card is
ready?
Unusable
Card
Unusable
Card
Unusable
Card
Card returns
busy
Card returns
ready
CCS in
Response?
Card returns ready
Ver2.
00 or later
Standard Capacity
SD Memory Card
CCS=0
CCS
=1
Not SD Memory Card
No response
CMD11
CMD3
If host supports high capacity, HCS is set to 1
CMD2
S18R and S18A ?
Ver2
.00 or later
High Capacity or
Extended Capacity
SD Memory Card
Ver1.X
Standard Capacity
SD Memory Card
S18R=1&S18A=1
S18R and S18A are negotiated in ACMD41
.
S18A is valid only when card returns ready
.
cards with non compatible
voltage range (
card goes to
'ina' state) or time-out
(
no response or busy) occurs
Ver2
.
00 or later
SD Memory Card
Ver2.00 or later SD Memory Card(voltage mismatch)
or Ver1.X SD Memory Card
or not SD Memory Card
Card with compatible
Voltage range
S18R=0 or S18A=0