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.
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