VT8231 datasheet(34/132 Pages) ETC

34 / 132 page

VT8231

Preliminary Revision 0.8 October 29, 1999

-28-

Pinouts

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Power and Ground

Signal Name

Pin #

I/O

Signal Description

VCC (27 Pins)

F7, F9, F12-F13, F15,

G6, G8-G10, G12,

H6, J6, J15, K15,

L6, M6, M15, N6,

P8-P9, P11-P13, P15,

R7, R9-R10, R13-R15

Core Power. 3.3V nominal (3.15V to 3.45V). This supply is turned on only

when the mechanical switch on the power supply is turned on and the

PWRON signal is conditioned high. These pins should be connected to the

same voltage as the CPU I/O circuitry.

Internally connected to hardware

monitoring system voltage detection circuitry for 3.3V monitoring.

GND (27 Pins)

G7, G11, G14, H15,

J8-J13, K6, K8-K13,

L8-L13, L15, M8-M13,

N15, P7, P10, P14

Ground. Connect to primary motherboard ground plane.

VCCSUS

P5, P6

Suspend Power. Always available unless the mechanical switch of the power

supply is turned off. If the “soft-off” state is not implemented, then this pin

can be connected to VCC. Signals powered by or referenced to this plane are:

SMBCK1/DT1, KBCK/DT, MSCK/DT, PWRBTN#, SUSC#, GPO0 /

SLOWCLK, GPO1 / SUSA#, GPO2 / SUSB#, GPO3 / SUSST1#, GPO4 /

SUSCLK, GPI1 / IRQ8#, GPI2 / EXTSMI#, GPI3 / RING#, GPI4 / LID,

GPI5 / BATLOW#, GPI6 / PME#, GPI7 / SMBALRT#, GPI16 / CPUMISS,

GPI17 / AOLGPI / THRM, GPIO26 / SMBDT2, GPIO27 / SMBCK2

VBAT

RTC Battery.

Battery input for internal RTC. Signals powered by or

referenced to this plane are: RTCX1, RTCX2, PWRGD, RSMRST#, GPI0,

and INTRUDER#.

VREF

Voltage Reference (5V

±5%). For thermal sensing and 5V input tolerance.

VCCHWM

Hardware Monitor Power.

Power for hardware monitoring subsystem

(voltage monitoring, temperature monitoring, and fan speed monitoring).

Connect to VCC through a ferrite bead. Signals powered by or referenced to

this plane are: UIC[5:1], DTD+/-, FAN1, FAN2 / SLPBTN# / GPIO18

GNDHWM

Hardware Monitor Ground. Connect to GND through a ferrite bead.

VCCMII

F16, K16

LAN MII Power. Power for LAN Media Independent Interface (interface to

external PHY). Connect to VCC through a ferrite bead. Signals powered by

or referenced to this plane are: MCRS, MCOL, MDCK, MDIO, MTXD[3:0],

MTXENA, MTXCLK, MRXERR, MRXCLK, MRXDV, and MRXD[3:0]

VCCRAM

G15

LAN RAM Power. Power for LAN internal RAM. Connect to VCC through

a ferrite bead.

GNDRAM

G13

LAN RAM Ground. Connect to GND through a ferrite bead.

VCCPLL

L16

PLL Power. Power for internal PLL. Connect to VCC through a ferrite

bead.

GNDPLL

M16

PLL Ground. Connect to GND through a ferrite bead.

VCCUSB

E15

USB Differential Output Power.

Power for USB differential outputs

(USBP0+, P0-, P1+, P1-, P2+, P2-, P3+, P3-). Connect to VCC through a

ferrite bead.

GNDUSB

D15

USB Differential Output Ground. Connect to GND through a ferrite bead.

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