MC56U032DCCA Datasheet, PDF (45/64 Pages) Samsung semiconductor – Dual Voltage MultiMediaCard Specification

MultiMediaCard^TM
Data Read Timing (Data Transfer Mode)
Data transfer stop command timing
The card data transmission can be stopped using the stop command. The data transmission stops
immediately with the end bit of the stop command.
Timing of Stop Command (CMD12,Data Transfer Mode)
Single or multiple block write
The host selects one card for data write operation by CMD7. The host sets the valid block length for
block oriented data transfer by CMD16. The host transfers the data with CMD24. The address of the
data block is determined by the argument of this command. This command is responded by the card on
the CMD line as usual. The data transfer from the host starts NWR clock cycles after the card response
was received. The write data have CRC check bits to allow the card to check the transferred data for
transmission errors. The card sends the CRC check information as a CRC status to the host (on the data
line). The CRC status contains the information if the write data transfer was non-erroneous (the CRC
check did not fail) or not.
In the case of transmission error the card sends a negative CRC status (“101” bin) which forces the host
to retransmit the data. In the case of non-erroneous transmission the card sends a positive CRC status
(“010” bin) and starts the data programming procedure.
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