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參數(shù)資料
| 型號： | 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)： | 39/79頁 |
| 文件大?。?/td> | 516K |
| 代理商： | FLAS00XX |
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MultiMediaCard Flash
Preliminary MultiMediaCard Product Manual;
1998 SANDISK CORPORATION
Page 39 of 79
Resetting an MultiMediaCard (using CMD0 or CMD15) will terminate any pending or
active programming operation. This may destroy the data contents on the
MultiMediaCard. It is up to the host’s responsibility to prevent this.
Figure 5-2 MultiMediaCard State Diagram (Data Transfer Mode
)
5.4.1 Data Read Format
The DAT bus line is high when no data is transmitted. A transmitted data block consists of
a start bit (LOW), followed by a continuous data stream. The data stream contains the net
payload data (and error correction bits if an off-card ECC is used). The data stream ends
with an end bit (HIGH) (see Figure 5-10 through Figure 5-12). The data transmission is
synchronous to the clock signal.
The payload for block oriented data transfer is preserved by a CRC check sum. The
generator polynomial is a standard CCITT polynomial
x
16
+x
12
+x
5
+ 1.
The code is a shortened BCH code with d=4 and is used for payload length of up to 2048
Bytes.
Stream read
There is a stream oriented data transfer controlled by READ_DAT_UNTIL_STOP
(CMD11). This command instructs the card to send its payload, starting at a specified
address, until the host sends a STOP_TRANSMISSION command (CMD12). Note that the
host stop command has an execution delay due to the serial command transmission. The
data transfer stops after the end bit of the next command, which has the interrupt ability.
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