Specifications

©Copyright 2001-2013 SD Group (Panasonic, SanDisk, Toshiba) and SD Card Association
Physical Layer Simplified Specification Version 4.10
33
4.3 Data Transfer Mode
Until the end of Card Identification Mode the host shall remain at f
OD
frequency because some cards
may have operating frequency restrictions during the card identification mode. In Data Transfer Mode
the host may operate the card in f
PP
frequency range. The host issues SEND_CSD (CMD9) to obtain
the Card Specific Data (CSD register), e.g. block length, card storage capacity, etc.
The broadcast command SET_DSR (CMD4) configures the driver stages of all identified cards. It
programs their DSR registers corresponding to the application bus layout (length) and the number of
cards on the bus and the data transfer frequency. The clock rate is also switched from f
OD
to f
PP
at that
point. SET_DSR command is an option for the card and the host.
CMD7 is used to select one card and put it into the Transfer State. Only one card can be in the Transfer
State at a given time. If a previously selected card is in the Transfer State its connection with the host is
released and it will move back to the Stand-by State. When CMD7 is issued with the reserved relative
card address "0x0000", all cards are put back to Stand-by State (Note that it is the responsibility of the
Host to reserve the RCA=0 for card de-selection - refer to Table 4-22, CMD7.
SD Memory Card State Diagram in UHS-II is defined by the UHS-II Addendum.
Figure 4-13: SD Memory Card State Diagram (data transfer mode)
This may be used before identifying new cards without resetting other already registered cards. Cards
which already have an RCA do not respond to identification commands (ACMD41, CMD2, see Chapter
4.2.3) in this state. CMD48, CMD49, CMD58 and CMD59 are also available in UHS-II mode.
CMD3
CMD7
CMD7
CMD13, CMD
55
CMD15
CMD20, 28,29,38
CMD7
CMD0
CMD7
Stand-by State
(stby)
Transfer
State (tran
)
CMD4,9,10,3
data transfer
mode
card identification
mode
no state transition
in data
-transfer-mode
CMD24,25,26,27,42,49,56(w),59
from all states in
data-transfer-mode
Disconnect
State (dis)
"operation
complete
"
Sending-data
State (data)
CMD6
,17,18,19,30,48,56(r),58
ACMD13,22,
51
CMD12, or
"operation
complete"
CMD16,23
,
32,
33
ACMD6,42
ACMD23
Receive-data
State (rcv)
CMD12 or
"transfer end"
Programming
State (prg)
"operation
complete"