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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） |
| 文件頁數(shù)： | 41/79頁 |
| 文件大?。?/td> | 516K |
| 代理商： | FLAS00XX |
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MultiMediaCard Flash
Preliminary MultiMediaCard Product Manual;
1998 SANDISK CORPORATION
Page 41 of 79
Block Write
Block write (CMD24 - 27) means that one or more blocks of data are transferred from the
host to the card with a CRC appended to the end of each block by the host. A card
supporting block write must always be able to accept a block of data defined by
WRITE_BL_LEN. If the CRC fails, the card will indicate the failure on the DAT line (see
below); the transferred data will be discarded and not written and all further transmitted
blocks (in multiple block write mode) will be ignored.
If the host uses partial blocks whose accumulated length is not block aligned and block
misalignment is not allowed (CSD parameter WRITE_BLK_MISALIGN is not set), the card
will detect the block misalignment error and abort programming before the beginning of the
first misaligned block. The card will set the ADDRESS_ERROR error bit in the status
register, and while ignoring all further data transfer, wait (in the Receive-Data-State) for a
stop command.
The write operation will also be aborted if the host tries to write over a write protected area.
In this case, however, the card will set the WP_VIOLATION bit.
Programming of the CID and CSD register does not require a previous block length
setting. The transferred data is also CRC protected. If a part of the CSD or CID register is
stored in ROM it will not be overwritten and the card will not check the ROM data with the
content of the receive buffer.
Some cards may require long and unpredictable times to write a block of data. After
receiving a block of data and completing the CRC check, the card will begin writing and
hold DAT low if its write buffer is full and unable to accept new data from a new
WRITE_BLOCK command. The host may poll the status of the card with a
SEND_STATUS command at any time, and the card will respond with its status. The
status bit READY_FOR_DATA indicates whether the MultiMediaCard can accept new data
or whether the write process is still in progress. The host may deselect the card by issuing
CMD7 (to select a different card) which will place the card in the Disconnect State and
release the DAT line without interrupting the write operation. When reselecting the card, it
will reactivate busy indication by pulling DAT to low if programming is still in progress and
write buffer is unavailable.
Erase
It is desirable to erase many sectors simultaneously in order to enhance the data
throughput. Identification of these sectors is accomplished with the TAG_* commands.
Either an arbitrary set of sectors within a single erase group, or an arbitrary selection of
erase groups may be erased at one time, but not both together. That is, the unit of
measure for determining an erase is either a sector or an erase group, but if a sector, all
selected sectors must lie within the same erase group. To facilitate selection, a first
command with the starting address is followed by a second command with the final
address, and all sectors within this range will be selected for erase. After a range is
selected, an individual sector (or group) within that range can be removed using the
UNTAG command.
The host must adhere to the following command sequence: TAG_SECTOR_START,
TAG_SECTOR_END, UNTAG_SECTOR (up to 16 untag sector commands can be sent
for one erase cycle) and ERASE (or the same sequence for group tagging). The following
exception conditions are detected by the MultiMediaCard:
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