8399 N/B Maintenance

5.3 VIA VT8235CD South Bridge(10)

Power and Ground

 

Signal Name

Pin #

I/O

VSUS33

AA4,

P

 

AB4-6

 

VSUS25

T4, U4

P

VSUSUSB

C24

P

VBAT

AF4

P

VLVREF

H22

P

VLCOMP

J22

AI

VCCVK

(see pin

P

 

list)

 

MIIVCC

D9,

P

 

E9-11

 

MIIVCC25

D12.

P

 

E12

 

LANVCC

E7

P

LANGND

E6

P

USBVCC

(see pin

P

 

list)

 

USBGND

(see pin

P

 

list)

 

VCCUPLL

A23,

P

 

B23

 

GNDUPLL

C23,

P

 

D23

 

PLLVCC

T22

P

PLLGND

U22

P

 

Power and Ground（Continued）

Signal Description

Signal Name

Pin #

I/O

Signal Description

Suspend Power. 3.3V ±5%. Always available unless the

VCC33

(see pin

P

I/O Power. 3.3V ±5%

mechanical switch of the power supply is turned off. If the

 

list)

 

 

ihsoft-offlÉD state is not implemented, then this pin can be

VCC

(see pin

P

Core Power. 2.5V ±5%. This supply is turned on

connected to VCC33. Signals powered by or referenced to

 

list)

 

only when the mechanical switch on the power

this plane are: PWRGD, RSMRST#, PWRBTN#,

 

 

 

supply is turned on and the PWRON signal is

SMBCK1/2, SMBDT1/2, GPO0, SUSA# / GPO1, SUSB# /

 

 

 

conditioned high.

GPO2, SUSC#, SUSST1# / GPO3, SUSCLK / GPO4,

GND

(see pin

P

Ground. Connect to primary motherboard ground plane.

GPI1, GPI2 / EXTSMI#, GPI3 / RING#, GPI4 / LID, GPI5

 

list)

 

 

/ BATLOW#, GPI6 / PME#, SMBALRT#

 

 

 

 

Suspend Power. 2.5V ±5%.

 

 

 

 

USB Suspend Power. 2.5V ±5%.

 

 

 

 

RTC Battery. Battery input for internal RTC (RTCX1,

 

Strap Pins for North Bridge Configuration

 

 

RTCX2)

 

Signal Name

Pin #

Function

Description

Note

V-Link Voltage Reference. 0.9V ±5% for 4x transfers and

 

 

SDCS3#

AF26

NB

SDCS3# signal state is reflected on Check the

0.625V ±5% for 8x transfers.

 

 

 

 

Configuratio

signal pinVD[7] during power up

NorthBridge DS

V-Link Compensation.

 

 

 

Document for North Bridgeconfiguration.

fordetails

V-Link Compensation Circuit Voltage. 2.5V ±5%

Confidential

SDA2

AE24

NB

SDA2 signal state is reflected on

Check the

 

 

LAN MII Power. 3.3V ±5%.Power for LAN Media

 

 

 

Configuratio

signal pinVD[6] during power up

NorthBridge DS

 

 

 

n

for North Bridgeconfiguration.

fordetails

Independent Interface (interface to external PHY). Co nect

 

 

 

 

SDA1

AC22

NB

SDA1 signal state is reflected on

Check the

to VCC33 through a ferrite bead.

 

 

 

 

Configuratio

signal pinVD[5] during power up

NorthBridge DS

LAN MII Suspend Power. 2.5V ±5%.

 

 

 

 

 

 

n

for North Bridgeconfiguration.

fordetails

 

 

 

 

LAN Power. 2.5V ±5%. Power or LAN. Connect to VCC

 

SDA0

AF24

NB

SDA0 signal states is reflected on

Check the

 

 

 

Configuratio

signal pinsVD[4] during power up

NorthBridge DS

through a ferrite bead.

 

 

 

 

 

 

n

for North Bridgeconfiguration.

fordetails

LAN Ground. Connect to GND through ferrite bead.

 

 

 

 

Strap_VD3

AC6

NB

Strap_VD3 signal state is reflected

Check the

USB 2.0 Differential Output Power. 3.3V ±5%. Power

 

 

 

Configuratio

on signal pinVD[3] during power

NorthBridge DS

for USB differential outputs (USBP0+, P0Œ, P1+, P1Œ,

 

 

 

n

up for North Bridgeconfiguration.

fordetails

P2+, P2Œ, P3+, P3Œ, P4+, P4Œ, P5+, P5Œ). Connect to

 

Strap_VD2

AD5

NB

Strap_VD2 signal state is reflected

Check the

VSUS33 through a ferrite bead.

 

 

 

Configuratio

on signal pinVD[2] during power

NorthBridge DS

USB 2.0 Differential Output Ground. Connect to GND

 

 

 

n

up for North Bridgeconfiguration.

fordetails

through a ferrite bead.

 

Strap_VD1

AE5

NB

Strap_VD1 signal state is reflected

Check the North

USB 2.0 PLL Analog Voltage. 2.5V ±5%. Connect to

 

 

 

Configuratio

on signal pin, VD[1] during power

Bridge DS for details

VCC through a ferrite bead.

 

 

 

n

up for North Bridge configuration.

 

USB 2.0 PLL Analog Ground. Connect to GND through a

 

Strap_VD0

AF5

NB

Strap_VD0 signal state is reflected

Check the

ferrite bead.

 

 

 

Configuratio

on signalpin, VD[0] during power

NorthBridge DS

PLL Analog Power. 2.5V ±5%. Connect to VCC through

 

 

 

n

up for North Bridgeconfiguration.

fordetails

a ferrite bead.

 

Note: Internal Pullups are present on pins KBCK, KBDT, MSCK, MSDT, SERIRQ, LAD[3:0]

PLL Analog Ground. Connect to GND through a ferrite

 

Internal Pulldowns are present on all LAN pins

bead.

 

89