Make your own free website on Tripod.com
Up ] Docs Home ]

Bitfields for Intel PIIX4 ISA I/O recovery timer

Back ] Next ]

Bit Description

7

disable aliasing PORTs 90h-9Fh into 80h-8Fh (except PORT 0092h)

6

enable 8-bit I/O recover timer in bits 5-3

5 - 3

additional 8-bit I/O recovery time (added to 3.5 SYSCLK minimum)
000 = 8 SYSCLKs, else N SYSCLKs

2

enable 16-bit I/O recovery timer in bits 1-0

1 - 0

additional 16-bit I/O recovery time (added to 3.5 SYSCLK minimum)
00 = 3 SYSCLKs
01 = 1 SYSCLK
10 = 2 SYSCLKs
11 = 4 SYSCLKs

See Also:

#01100