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kepler wrote:
This message is from the T13 list server.
CFA feature set implemented ATA device may support 8-bit data transfer.
Through SET FEATURES command, 8/16-bit data transfer mode is switched.
Therefore, 8-bit mode may be used by CFA WRITE MULTIPLE WITHOUT ERASE
and CFA WRITE SECTORS WITHOUT ERASE commands.
If a CF device is placed into 8-bit data transfer mode: a) ALL following
PIO data transfer commands will be in 8-bit mode using only DD7:0 of the
Data register (requiring n*512 reads or writes to transfer a single DRQ
block, instead of n*256 reads or writes when not in 8-bit mode). b) ALL
DMA transfers (MultiWord DMA or UltraDMA) are done in 16-bit mode using
DD15:0 (even when PIO transfers are done in 8-bit mode). See the CF
specification available at www.compactflash.org.
Hale
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++ Hale Landis ++ [EMAIL PROTECTED] ++
