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MC1GU064HCYB-0QC00 Datasheet(数据表) 31 Page - Samsung semiconductor

部件型号  MC1GU064HCYB-0QC00
说明  MultiMediaCard Specification
下载  66 Pages
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制造商  SAMSUNG [Samsung semiconductor]
网页  http://www.samsung.com/Products/Semiconductor
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MC1GU064HCYB-0QC00 Datasheet(HTML) 31 Page - Samsung semiconductor

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MultiMediaCard
TM
31
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:
- broadcast commands (bc) sent on CMD line, no response.
- broadcast commands with response (bcr) sent on CMD line, response (all cards simultaneously) on
CMD line
- 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,
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):
0
1
Bit5 …. Bit0
Bit31 …. Bit0
Bit6 …. Bit0
1
Start bit
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
Type
Argument
Resp
Abbreviation
Command description
CMD0
bc
[31:0] stuff bits
GO_IDLE_STATE
Resets all card to Idle State
CMD1
bcr
[31:0] OCR
without busy
R3
SEND_OP_COND
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”).
CMD2
bcr
[31:0] stuff bits
R2
ALL_SEND_CID
Asks all cards in ready state to send their
CID
*1 numbers on CMD-line
CMD3
ac
[31:16] RCA
[15:0] stuff bits
R1
SET_RELATIVE_A
DDR
Assigns relative address to the card in
identification state.
CMD4
bc
[31:16] DSR
[15:0] stuff bits
SET_DSR
Programs the DSR of all cards in stand-by
state.
These Samsung MultiMediaCard do not
support this command
CMD7
ac
[31:16] RCA
[15:0] stuff bits
R1 (only
the
select
ed
card)
SELECT/
DESELECT_CARD
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.
CMD8
reserved
CMD9
ac
[31:16] RCA
R2
SEND_CSD
Asks the addressed card to send its card-




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