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4.5 ATA Commands
C156-E227-01EN 4-39
Table 4.33 Transfer setting values in the SC register
Setting value
Bit 7 to bit 3 Bit 2 to bit 0
Function ODD response
0000 000 PIO default transfer mode Ends normally.
001 Ends normally.00000
010 to 111
PIO default transfer mode
(The IORDY signal is not
used.)
Reports Aborted Command.
000 Ends normally.
001 Ends normally.
010 Ends normally.
011 Ends normally.
100 Ends normally.
00001
101 to 111
PIO flow control transfer
mode
(The IORDY signal is used.)
Reports Aborted Command.
00010 000 to 111 Reserved Reports Aborted Command.
00100 000 Sets multiword DMA mode as the
ODD internal transfer mode and
ends normally
00100 001 Sets multiword DMA mode as the
ODD internal transfer mode and
ends normally
00100 010 Sets multiword DMA mode as the
ODD internal transfer mode and
ends normally
00100 011 to 111
Multiword DMA transfer
mode
Reports Aborted Command.
000 Sets Ultra DMA mode as the ODD
internal transfer mode and ends
normally.
001 Sets Ultra DMA mode as the ODD
internal transfer mode and ends
normally.
010 Sets Ultra DMA mode as the ODD
internal transfer mode and ends
normally.
01000
011 to 111
Ultra DMA transfer mode
Reports Aborted Command.
10000 000 to 111 Reserved Reports Aborted Command.