參數(shù)資料
型號(hào): flas00xx
廠商: SIEMENS AG
英文描述: MultiMediaCard(多媒體卡)
中文描述: 多媒體卡(多媒體卡)
文件頁數(shù): 72/79頁
文件大?。?/td> 516K
代理商: FLAS00XX
MultiMediaCard Flash
Preliminary MultiMediaCard Product Manual;
1998 SANDISK CORPORATION
Page 72 of 79
6.2.1 Command Format
All the MultiMediaCard commands are 6 bytes long and transmitted MSB first.
Byte 1
7 6 0
Bytes 2-5
Byte 6
7 0
0
1
Command
Command Argument
CRC
1
Commands and arguments are listed in Table 6-4.
7-bit CRC Calculation: G(x) = x
7
+ x
3
+ 1
M(x) = (start bit)
x
39
+ (host bit)
x
38
+...+ (last bit before CRC)
x
0
CRC[6...0] = Remainder[(M(x)
x
7
)/G(x)]
6.2.1.1 Detailed Command Description
The following table provides a detailed description of the SPI bus commands. The table
lists all MultiMediaCard commands. A “yes” in the SPI-mode colon indicates that the
command is supported under SPI mode. If a command does not require an argument, the
value of this field should be set to zero. The reserved commands are reserved in
MultiMediaCard mode as well.
The binary code of a command is defined by the mnemonic symbol. As an example, the
content of the Command field for CMD0 is (binary) ‘000000’ and for CMD39 is (binary)
‘100111.’
Table 6-1 Description of SPI Bus Commands
CMD INDEX
SPI Mode
Argument
Resp
Abbreviation
Command Description
CMD0
Yes
None
R1
GO_IDLE_STATE
Resets the MultiMediaCard
CMD1
Yes
None
R1
SEND_OP_COND
Activates the card’s initialization process.
CMD2
No
CMD3
No
CMD4
No
CMD5
reserved
CMD6
reserved
CMD7
No
CMD8
reserved
CMD9
Yes
None
R1
SEND_CSD
Asks the selected card to send its card-
specific data (CSD).
CMD10
Yes
None
R1
SEND_CID
Asks the selected card to send its card
identification (CID).
CMD11
No
CMD12
No
CMD13
Yes
None
R2
SEND_STATUS
Asks the selected card to send its status
register.
CMD14
reserved
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