MC56U032NCFA Samsung Semiconductor, Inc., MC56U032NCFA Datasheet - Page 31

• Manufacturer Part Number: MC56U032NCFA
• Description: Flash Card
• Manufacturer: Samsung Semiconductor, Inc.

The MultiMediaCard supports the following MultiMediaCard commands :
Table 4-8 Detailed Command Description
CMD
Index
CMD0
CMD1
CMD2
CMD3
CMD4
CMD7
CMD8
CMD9
MultiMediaCard
Class 0 is mandatory and supported by all cards. It represents the card identification and initialization
commands, which are intended to handle different cards and card types on the same bus lines. The
Card Command Class (CCC) is coded in the card specific data register of each card, so that the host
knows how to access the card. There are four kinds of commands defined on the MultiMediaCard bus:
-
-
CMD line
-
-
data transfer on DAT line.
The command transmission always starts with the MSB. Each command starts with a start bit and ends
with a CRC command protection field followed by an end bit. The length of each command frame is
fixed to 48 bits (2.4 us at 20 MHz):
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)”.
broadcast commands (bc) sent on CMD line, no response.
addressed (point-to-point) commands (ac) sent on CMD line, response on CMD line.
addressed (point-to-point) data transfer commands (adtc) sent on CMD line, response on CMD line,
broadcast commands with response (bcr) sent on CMD line, response (all cards simultaneously) on
bc
bcr
bcr
ac
bc
ac
reserved
ac
Type
0
Start bit
[31:0] stuff bits
[31:0] OCR
[31:0] stuff bits
[31:16] RCA
[15:0] stuff bits
[31:16] DSR
[15:0] stuff bits
[31:16] RCA
[15:0] stuff bits
[31:16] RCA
without busy
Argument
TM
1
Host
ㅡ
R3
R1
ㅡ
R1 (only
R2
R2
Resp
the
select
ed
card)
Bit5 …. Bit0
Command
GO_IDLE_STATE
SEND_OP_COND
ALL_SEND_CID
SET_RELATIVE_A
SET_DSR
SELECT/
DESELECT_CARD
SEND_CSD
DDR
Abbreviation
Argument
Bit31 …. Bit0
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
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-
Bit6 …. Bit0
CRC*1
*1
numbers on CMD-line
Command description
1
End Bit
31