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MultiMediaCard Product Manual
6.2.3
Data Tokens
Read and write commands have data transfers
associated with them. Data is being transmitted
or received via data tokens. All data bytes are
transmitted MSB.
Data tokens are 4 to 515 bytes long and have t h e
following format:
• Byte 1: Start Byte
7
1 1 1 1 1 1 1 0
• Bytes 2-513 (depends on the data block
length): User data
• Last two bytes: 16 bit CRC.
6.2.4
Data Error Token
If a read operation fails and the card cannot
provide the required data it will sent a data error
token, instead. This token is one byte long and has
the following format:
7
0
0 0 0
Figure 6-7 Data Error Token
The 4 LSBs are the same error bits as in response
format R2.
70
0
0
Error
CC_Error
Card_ECC_Failed
Out_of_Range
SanDisk MultiMediaCard Product Manual Rev. 2 © 2000 SANDISK CORPORATION
6.3
Card Registers
In SPI Mode, only the MultiMediaCard, CSD and
CID registers are accessible. Their format is
identical to their format in the MultiMediaCard
mode. However, a few fields are irrelevant in SPI
mode.
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