VT82C596 datasheet(26/96 Pages) ETC

26 / 96 page

VT82C596B

Revision 0.3 June 17, 1999

-20-

Pinouts

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Resets and Clocks

Signal Name

Pin #

I/O

Signal Description

PWRGD

M18

Power Good. Connected to the PWRGOOD signal on the Power Supply.

PCIRST#

PCI Reset. Active low reset signal for the PCI bus. The VT82C596B will assert

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

RSTDRV

Reset Drive. Reset signal to the ISA bus.

BCLK

Bus Clock. ISA bus clock.

OSC

V11

Oscillator. 14.31818 MHz clock signal used by the internal Timer.

SUSCLK

P17

Suspend Clock.

32.768 KHz output clock for use by the North Bridge (e.g.,

VT82C598 Apollo MVP3) for DRAM refresh purposes. Stopped during Suspend-to-

Disk and Soft-Off modes.

Configuration and Test

Signal Name

Pin #

I/O

Signal Description

CFG1

R17

Configuration 1. Used to select the CPU type (0=Socket-7, 1=Slot-1). Determines

the polarity of the INIT and CPURST signals.

CFG2

R18

Configuration 2. Used to select the type of decoding for the top 64 Kbytes of

memory (FFFF0000h-FFFFFFFFh): 0 = Positive decode, 1 = Subtractive decode.

TEST#

V18

Test. Used to select chip test modes. Pulled up externally to VCCSUS for normal

operation.

Power and Ground

Signal Name

Pin #

I/O

Signal Description

VCC

E9, E11, E12,

E16, F5, F6,

F14, F15, G6,

P15, R6, R7,

R15, T6

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. This pin should be connected to the same voltage as the CPU I/O

circuitry.

VREF

J16

Voltage Reference. 5V nominal (4.75 to 5.25) to provide 5V input tolerance. This

voltage should be on only when the mechanical switch on the power supply is turned

on and the PWRON signal is conditioned high.

VCCSUS

N16, R16

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: BATLOW#,

CFG1-2, EXTSMI#, GPI1, GPO8, IRQ8#, LID, RI#, SMBALRT#, SMBCLK,

SMBDATA, PWRBTN#, SUS[A-C]#, SUSCLK, SUSST[1-2]#, TEST#, PWROK,

RSMRST#.

VBAT

L16

RTC Battery. Battery input for internal RTC (RTCX1, RTCX2)

VCCUSB

USB Differential Output Power Source (USBP0+, P0-, P1+, P1-)

GNDUSB

USB Differential Output Ground

GND

D10, E7, E13,

J9-12, K9-12,

L9-12, M9-12

Ground

J4, M5, M16,

N3, N18, R5

No Connect

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