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): 69/79頁
文件大小: 516K
代理商: FLAS00XX
MultiMediaCard Flash
Preliminary MultiMediaCard Product Manual;
1998 SANDISK CORPORATION
Page 69 of 79
6.1.2.1 Data Read
SPI mode supports single block read operation only (MultiMediaCard CMD17). Upon
reception of a valid read command the card will respond with a response token followed by
a data token in the length defined in a previous SET_BLOCK_LENGTH (CMD16)
command (refer to Figure 6-1).
Figure 6-1 Read Operation
A valid data block is suffixed with a 16 bit CRC generated by the standard CCITT
polynomial:
x
16
+x
12
+x
5
+1.
The maximum block length is defined by READ_BL_LEN (CSD parameter). If partial
blocks are allowed (the CSD parameter READ_BL_PARTIAL equals 1) the block length
can be any number between 1 and READ_BL_LEN. Otherwise the only valid block length
for data read is given by READ_BL_LEN.The start address can be any byte address in the
valid address range of the card. Every block, however, must be contained in a single
physical card sector.
In case of data retrieval error, the card will not transmit any data. Instead, a special data
error token will be sent to the host. Figure 6-2 shows a data read operation which
terminated with an error token rather than a data block.
Figure 6-2 Read Operation - Data Error
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