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Bitfields for Intel 82425EX local-bus IDE control register

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Bit Description

1 - 0

primary/secondary PCI IDE enable
00 = IDE disabled
01 = primary (ports 01F0h-01F7h,03F6,03F7h)
10 = secondary (ports 0170h-017Fh,0376h,0377h)
11 = reserved

3 - 2

fast timing bank drive select 1
bit 2 : drive 0 enabled
bit 3 : drive 1 enabled

5 - 4

IORDY sample point Enable Drive Select
bit 4 : drive 0 enabled
bit 5 : drive 1 enabled

7 - 6

reserved

9 - 8

IORDY sample point
00 = 6 clocks
01 = 5 clocks
10 = 4 clocks
11 = 3 clocks

12 - 10

recover time
000 = 8 PCI clocks
001 = 7 PCI clocks
010 = 6 PCI clocks
011 = 5 PCI clocks
100 = 4 PCI clocks
101 = 3 PCI clocks
110 = 3 PCI clocks
111 = 3 PCI clocks

15 - 13

reserved

See Also:

#01083,#01084