8399 N/B Maintenance

5.3 VIA VT8235CD South Bridge(6)

AC97 Audio / Modem Interface

 

 

 

 

 

Internal Keyboard Controller

 

Signal Name

Pin #

I/O Signal Description

 

 

 

Signal Name

Pin #

I/O

PU Signal Description

ACRST#

T3

O

AC97 Reset.

 

 

 

 

MSCK / IRQ1

W1

IO / I

PU

MultiFunction Pin (Internal mouse controller enabled by

ACBTCK

T1

I

AC97 Bit Clock.

 

 

 

 

 

 

 

 

Rx51[1])

 

 

 

 

 

 

 

 

Rx51[2]=1 Mouse Clock. From internal mouse controller.

ACSYNC

T2

O

AC97 Sync.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Rx51[2]=0 Interrupt Request 1. Interrupt input 1.

ACSDO

U2

O

AC97 Serial Data Out.

 

 

 

MSDT / IRQ12

W2

IO / I

PU

MultiFunction Pin (Internal mouse controller enabled by

ACSDIN0

U3

I

AC97 Serial Data In 0.

 

 

 

 

 

 

 

Rx51[1])

 

 

DocumentRx51[0])

(VSUS33)ƒ

 

 

 

 

 

 

 

 

 

 

 

 

Rx51[2]=1 Mouse Data. From internal mouse controller.

V2

I

AC97 Serial Data In 1.

 

Secret

 

 

 

Rx51[2]=0 Interrupt Request 12. Interrupt input 12.

ACSDIN1

 

 

 

 

 

 

 

 

 

 

 

 

 

 

KBCK / KA20G

W3

IO / I

PU

MultiFunction Pin (Internal keyboard controller enabled

(VSUS33)ƒ

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

by

ACSDIN2 /

U1

I

AC97 Serial Data In 2. RxE4[6]=0,E5[1]=0, PMIO Rx4C[20]=1

 

 

 

 

 

 

 

 

 

 

 

 

Rx51[0])

GPIO20 / PCS0#

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Rx51[0]=1 Keyboard Clock. From internal keyboard

ACSDIN3 /

V3

I

AC97 Serial Data In 3. RxE4[6]=0,E5[2]=0, PMIO Rx4C[21]=1

 

 

 

 

 

 

 

 

 

 

 

 

controller

GPIO21 / PCS1#

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Rx51[0]=0 Gate A20. Input from external keyboard

/ SLPBTN#

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

controller.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

KB T / KBRC

V1

IO / I

PU

MultiFunction Pin (Internal keyboard controller enabled

 

 

 

 

 

Confidential

 

 

 

 

by

 

 

 

 

Timer.

Speaker

 

 

 

Rx51[0]=1 Keyboard Data. From internal keyboard

Resets, Clocks, and Power Status

 

MiTac

 

 

 

 

 

controller.

Signal Name

Pin #

 

I/O

Signal Description

 

 

 

 

 

Rx51[0]=0 Keyboard Reset. From external keyboard

PWRGD

AC5

 

I

Power Good. Connected to the Power Good sig al on the

 

 

 

 

 

 

controller

 

 

 

 

Power Supply. Internal logic

 

 

 

 

 

 

 

(KBC) for CPURST# generation

 

 

 

 

 

 

 

KBCS# / strap

AF10

O

 

Keyboard Chip Select (Rx51[0]=0). To external keyboard

 

 

 

 

powered by VBAT.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

controller chip. Strap high to enable LPC BIOS ROM.

PWROK#

AF1

 

O

Power OK. Internal logic powered by VSUS33.

 

 

 

 

 

 

 

 

 

Note: KBCK, KBDT, MSCK, and MSDT are powered by the VSUS33 suspend voltage plane.

PCIRST#

R1

 

O

PCI Reset. Active low reset sig

or the PCI bus. The

 

 

 

 

 

 

 

 

 

 

 

 

 

 

VT8235 Version CE will assert

 

 

 

 

 

 

 

 

 

 

 

 

this pin during power-up r from the control register.

 

 

 

 

 

 

 

OSC

AB8

 

I

Oscillator. 14.31818 MHz clock signal used by the internal

 

 

 

 

 

 

RTCX1

AE4

 

I

RTC Crystal Input: 32.768 KHz crystal or oscillator

 

 

Signal Name

Pin #

I/O

PU Signal Description

 

 

 

 

input. This input is used for the

 

 

 

SPKR / strap

AF8

O

 

Speaker. Strap low to enable (high to disable) CPU

 

 

 

 

internal RTC and power-well power management logic and

 

 

 

 

 

 

 

 

 

 

 

 

 

frequency

 

 

 

 

is powered by VBAT.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

strapping.

RTCX2

AF3

 

O

RTC Crystal Output: 32.768 KHz crystal output. Internal

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

logic powered by VBAT.

 

 

 

 

 

 

 

 

TEST

AE9

 

I

Test.

 

 

 

 

 

 

 

 

 

TPO

AF9

 

O

Test Pin Output. Output pin for test mode.

 

 

 

 

 

 

 

NC

(see pin

 

–

No Connect. Do not connect.

 

 

 

 

 

 

 

 

 

list)

 

 

 

 

 

 

 

 

 

 

 

85