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Bitfields for AMD-645 UltraDMA/33 Extended Timing Control register

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Bit Description

7

method for enabling UltraDMA mode on drive:
0 = using "Set Feature" command
1 = using bit 6 of this register

6

enable UltraDMA mode for drive

5

UltraDMA transfer mode:
0 = UltraDMA DMA mode
1 = UltraDMA PIO mode

4 - 2

reserved (0)

1 - 0

drive cycle time:
00 = 2T
01 = 3T
10 = 4T
11 = 5T

See Also:

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