VT82C596 datasheet(20/96 Pages) ETC

20 / 96 page

VT82C596B

Revision 0.3 June 17, 1999

-14-

Pinouts

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Internal Real Time Clock

Signal Name

Pin #

I/O

Signal Description

RTCX1

N19

RTC Crystal Input: 32.768 KHz crystal or oscillator input.

RTCX2

R20

RTC Crystal Output: 32.768 KHz crystal output

RTCCS# / GPO24

MultiFunction Pin

External RTC Chip Select. (Rx76[0] = 0) Asserted for read or write accesses to

RTC port 71h. Externally connected to a pair of OR gates (to logically AND

the chip select with IOR# and IOW#) to generate the active-low RTC read and

write commands.

General Purpose Output 24. (Rx76[0] = 1) General purpose output.

RTCAS / GPO25

MultiFunction Pin

External RTC Address Strobe. (Rx76[1] = 0) Asserted for writes to RTC I/O

Port 70h.

General Purpose Output 25. (Rx76[1] = 1) General purpose output.

Internal Keyboard Controller

Signal Name

Pin #

I/O

Signal Description

KEYLOCK / PIRQ1

Extended Function (PIIX4 PIRQ1)

Rx59[1]=1

Key Lock. Input to internal keyboard controller

KBCK / NC

Extended Function (PIIX4 No Connect)

Rx5A[0]=1 (Internal keyboard controller enabled –strapped from XD0)

Keyboard Clock

KBDT / NC

Extended Function (PIIX4 No Connect)

Rx5A[0]=1 (Internal keyboard controller enabled –strapped from XD0)

Keyboard Data

MSCK / A20GATE

MultiFunction Pin

Rx5A[1]=0 (internal keyboard controller disabled – strapped from XD1)

Gate A20. From optional external keyboard controller

Rx5A[1]=1 (internal keyboard controller enabled –strapped from XD1)

Mouse Clock. Mouse clock (extended function not available on PIIX4)

MSDT / KBCS# / GPO26

MultiFunction Pin

Rx5A[1]=0 (Internal keyboard controller disabled –strapped from XD1)

Keyboard Controller Chip Select. (Rx76[2]=0 external keyboard controller

enabled) Chip select for external keyboard controller.

General Purpose Output 26

(Rx76[2]=1 external keyboard controller

disabled) General purpose output

Rx5A[1]=1 (Internal keyboard controller enabled –strapped from XD1)

Mouse Data. Mouse data (extended function not available on PIIX4)

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