VT82C596B datasheet(42/96 Pages) ETC

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VT82C596B

Revision 0.3 June 17, 1999

-36-

PCI Function 0 Registers - PCI-to-ISA Bridge

7HFKQRORJLHV ,QF

:H &RQQHFW

ISA Bus Control

Offset 40 - ISA Bus Control..............................................RW

ISA Command Delay

Normal ...................................................default

1Extra

Extended ISA Bus Ready

Disable ...................................................default

1Enable

ISA Slave Wait States

4 Wait States ..........................................default

5 Wait States

Chipset I/O Wait States

2 Wait States ..........................................default

4 Wait States

I/O Recovery Time

Disable ...................................................default

1Enable

Extend-ALE

Disable ...................................................default

1Enable

1ROM Wait States

1 Wait State ............................................default

0 Wait States

ROM Write

Disable ...................................................default

1Enable

Offset 41 - ISA Test Mode ................................................RW

Bus Refresh Arbitration (do not program) default=0

XRDY Test Mode (do not program)........... default=0

Port 92 Fast Reset

Disable ...................................................default

1Enable

A20G Emulation (do not program)............. default=0

Double DMA Clock

Disable (DMA Clock = ½ ISA Clock) ...default

Enable (DMA Clock = ISA Clock)

SHOLD Lock During INTA (do not program) def=0

Refresh Request Test Mode (do not program) def=0

ISA Refresh

Disable ...................................................default

1Enable

Offset 42 - ISA Clock Control.......................................... RW

Latch IO16#

Enable (recommended setting) .............. default

Disable

MS16# Output

Enable (recommended setting) .............. default

Disable

Master Request Test Mode (do not program)..def=0

Reserved (no defined function) ................. default = 0

ISA CLOCK Select Enable

ISA Clock = PCICLK/4......................... default

ISA Clock selected per bits 2-0

2-0

ISA Bus Clock Select (if bit-3 = 1)

000 PCICLK/3.............................................. default

001 PCICLK/2

010 PCICLK/4

011 PCICLK/6

100 PCICLK/5

101 PCICLK/10

110 PCICLK/12

111 OSC

Note: Procedure for ISA CLOCK switching:

1) Set bit 3 to 0; 2) Change value of bit 2-0; 3) Set bit 3 to 1

VT82C596B Datenblatt(PDF) 42 Page - List of Unclassifed Manufacturers

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