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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(yè)數(shù)： | 44/79頁(yè) |
| 文件大?。?/td> | 516K |
| 代理商： | FLAS00XX |
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MultiMediaCard Flash
Preliminary MultiMediaCard Product Manual;
1998 SANDISK CORPORATION
Page 44 of 79
commands (e.g. SET(CLEAR)_WRITE_PROTECT, PROGRAM_CSD(CID) and the block
write commands). It should be used by the host to calculate throughput and the maximal
frequency for stream write. Erase The duration of an erase command will be (order of
magnitude) the number of sectors to be erased multiplied by the block write delay.
5.5 Commands
5.5.1 Command Types
There are four kinds of commands defined on the MultiMediaCard bus:
Broadcast commands (bc)—sent on CMD, no response
Broadcast commands with response (bcr)— sent on CMD, response (all cards
simultaneously) on CMD
Addressed (point-to-point) commands (ac)—sent on CMD, response on CMD
Addressed (point-to-point) data transfer commands (adtc)—sent on CMD, response on
CMD, data transfer on DAT
The command transmission always starts with the MSB.
5.5.2 Command Format
(Command length 48 bits, 2.4
μ
s @ 20 MHz)
0
1
bit 5...bit 0
bit 31...bit 0
bit 6...bit 0
1
start bit
host
command
argument
CRC7
1
end bit
Commands and arguments are listed in Table 5-3 through Table 5-9.
7-bit CRC Calculation: G(x) = x
7
+ x
3
+ 1 M(x) = (start bit)
x
39
bit before CRC)
x
0
CRC[6...0] = Remainder[(M(x)
x
7
)/G(x)]
+ (host bit)
x
38
+...+ (last
5.5.3 Command Classes
The command set of the MultiMediaCard is divided into several classes (See Table 5-2).
Each class supports a set of MultiMediaCard functions.
Class 0 is mandatory and supported by all MultiMediaCards. The other classes are
optional and can be interpreted as a tool box. By using different classes, several
configurations can be chosen (e.g. a block writable card or a stream readable card). The
supported Card Command Classes (CCC) are coded as a parameter in the card specific
data (CSD) register of each card, providing the host with information on how to access the
card.
1
7-bit Cyclic Redundancy Check.
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