MC56U032DCCA Datasheet, PDF (30/64 Pages) Samsung semiconductor – Dual Voltage MultiMediaCard Specification

MultiMediaCard^TM
0
Start bit
1
Bit5 …. Bit0 Bit31 …. Bit0 Bit6 …. Bit0 1
Host Command Argument
CRC*1
End Bit
The start bit is always ‘0’ in command frames (sent from host to MultiMediaCard). The host bit is
always ‘1’ for commands. The command field contains the binary coded command number. The
argument depends on the command (refer to Table “Basic Commands (class 0) and Table “Block-
Oriented Read Commands (class 2)”). The CRC field is defined in Chapter “Cyclic Redundancy Check
(CRC)”.
The MultiMediaCard supports the following MultiMediaCard commands :
Table 4-8 Detailed Command Description
CMD
Index
CMD0
CMD1
Type
bc
bcr
Argument
[31:0] stuff bits
[31:0] OCR
without busy
Resp
Ɩ
R3
Abbreviation
GO_IDLE_STATE
SEND_OP_COND
CMD2 bcr
CMD3 ac
CMD4 bc
[31:0] stuff bits R2
[31:16] RCA R1
[15:0] stuff bits
[31:16] DSR Ɩ
[15:0] stuff bits
ALL_SEND_CID
SET_RELATIVE_A
DDR
SET_DSR
CMD7 ac
[31:16] RCA
[15:0] stuff bits
R1 (only
the
select
ed
card)
SELECT/
DESELECT_CARD
CMD8 reserved
CMD9 ac
CMD10 ac
CMD11 adtc
[31:16] RCA R2
[15:0] stuff bits
[31:16] RCA R2
[15:0] stuff bits
[31:0] data
R1
address
SEND_CSD
SEND_CID
READ_DAT_UNTIL
_STOP
CMD12 ac
[31:0] stuff bits R1 or STOP_TRANSMISS
R1b ^*3 ION
CMD13 ac [31:16] RCA R1
[15:0] stuff bits
CMD14 reserved
CMD15 ac [31:16] RCA Ɩ
SEND_STATUS
GO_INACTIVE_STA
Command description
Resets all card to Idle State
Checks for cards not supporting the full
range of 2.0V to 3.6V. After receiving CMD1
the card sends an R3 response (refer to
Chapter “Responses”).
Asks all cards in ready state to send their
CID ^*1 numbers on CMD-line
Assigns relative address to the card in
identification state.
Programs the DSR of all cards in stand-by
state.
These Samsung MultiMediaCard do not
support this command.
Command toggles a card between the
standby and transfer states or between the
programming and disconnect state. In both
cases the card is selected by its own
relative address while deselecting the prior
selected card. Address 0 deselects all.
Asks the addressed card to send its card-
specific data (CSD) ^*2 on CMD-line.
Asks the addressed card to send its card
identification (CID) on CMD-line.
Reads data stream from the card, starting at
the given address, until a
STOP_TRANSMISSION follows.
These Samsung MultiMediaCard do not
support this command
Terminates a read/write stream/multiple
block operation. When CMD12 is used to
terminate a read transaction the card will
respond with R1. When it is used to stop a
write transaction the card will respond with
R1b.
Asks the addressed card to send its status
register.
Sets the card to inactive state in order to
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