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600X CompactFlash Card
Transcend Information Inc.
V1.0
32
equal to the fastest mode of which the device is capable. Only one Ultra DMA mode shall be selected at any given time.
All timing requirements for a selected Ultra DMA mode shall be satisfied. Devices supporting any Ultra DMA mode shall
also support all slower Ultra DMA modes.
An Ultra DMA capable device shall retain the previously selected Ultra DMA mode after executing a software reset
sequence or the sequence caused by receipt of a DEVICE RESET command if a SET FEATURES disable reverting to
defaults command has been issued. The device may revert to a Multiword DMA mode if a SET FEATURES enable
reverting to default has been issued. An Ultra DMA capable device shall clear any previously selected Ultra DMA mode
and revert to the default non-Ultra DMA modes after executing a power-on or hardware reset.
Both the host and device perform a CRC function during an Ultra DMA data burst. At the end of an Ultra DMA data burst
the host sends its CRC data to the device. The device compares its CRC data to the data sent from the host. If the two
values do not match, the device reports an error in the error register. If an error occurs during one or more Ultra DMA data
bursts for any one command, the device shall report the first error that occurred. If the device detects that a CRC error
has occurred before data transfer for the command is complete, the device may complete the transfer and report the error
or abort the command and report the error.
NOTE -If a data transfer is terminated before completion, the assertion of INTRQ should be passed through to the host
software driver regardless of whether all data requested by the command has been transferred.