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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)： | 70/79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 70 of 79
6.1.2.2 Data Write
As for the read operation, while in SPI mode the MultiMediaCard supports single block
write only. Upon reception of a valid write command (MultiMediaCard CMD24) the card will
respond with a response token and will wait for a data block to be sent from the host. CRC
suffix, block length and start address restrictions are identical to the read operation (refer
to Figure 6-3).
Figure 6-3 Write Operation
After a data block is received the card will respond with a data-response token and if the
data block is received with no errors it will be programmed. As long as the card is busy
programming, a continuous stream of busy tokens will be sent to the host (effectively
holding the dataOut line low).
Once the programming operation is completed, the host must check the results of the
programming using the SEND_STATUS command (CMD13). Some errors (e.g. address
out of range, write protect violation, etc.) are detected during programming only. The only
validation check performed on the data block and communicated to the host via the data-
response token is CRC.
Resetting the CS signal while the card is busy, will not terminate the programming
process. The card will release the dataOut line (tristate) and continue to program. If the
card is reselected before the programming is done, the dataOut line will be forced back to
low and all commands will be rejected.
Resetting a card (using CMD0) will terminate any pending or active programming
operation. This may destroy the data formats on the card. It is the host’s responsibility to
prevent it.
6.1.2.3 Erase & Write Protect Management
The erase and write protect management procedures in the SPI mode are identical to the
MultiMediaCard mode. While the card is erasing or changing the write protection bits of the
predefined sector list it will be in a busy state and will hold the dataOut line low. Figure 6-4
illustrates a “no data” bus transaction with and without busy signaling.
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