MultiMediaCardTM
Data Response
Every data block written to the card will be acknowledged by a data response token. It is one byte long
and has the following format:
Figure 4-11 Data Response
The meaning of the status bits is defined as follows:
‘010’ - Data accepted
‘101’ - Data rejected due to a CRC error.
‘110’ - Data rejected due to a Write Error.
4.10.13 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 first.
Data tokens are 4 to (N + 3) bytes long (Where N is the data block length set using the
SET_BLOCK_LENGTH Command) and have the following format :
- First byte: Start Byte
Token Type
Start Block
Start Block
Start Block
Start Block
Stop Tran
Transaction Type
Single Block Read
Multiple Block Read
Single Block Write
Multiple Block Write
Multiple Block Write
7
1
1
1
1
1
Bit Position
0
0
0
0
0
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
0
0
Figure 4-12 Data Tokens
- Bytes 2 – (N + 1) : User data
- Last two bytes: 16 bit CRC.
4.10.14 Data Error Token
If a read operation fails and the card cannot provide the required data, it will send a data error token
instead. This token is one byte long and has the following format:
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