AM79C975VCW datasheet(38/304 Pages) AMD

38 / 304 page

Am79C973/Am79C975

P R E L I M INARY

(MRX_DONEM, MTX_DONEM) located in the Com-

mand register.

Note: The SMI interrupt acknowledge does not follow

the SMBus alert protocol, but simply requires clearing

the interrupt bit.

Power Supply

VDDB

I/O Buffer Power (6 Pins)

+3.3 V Power

There are seven power supply pins that are used by the

input/output buffer drivers. All VDDB pins must be con-

nected to a +3.3 V supply.

VDD_PCI

PCI I/O Buffer Power (9 Pins)

+3.3 V Power

There are nine power supply pins that are used by the

PCI input/output buffer drivers (except PME driver). All

VDD_PCI pins must be connected to a +3.3 V supply.

VSSB

I/O Buffer Ground (17 Pins)

Ground

There are 17 ground pins that are used by the input/

output buffer drivers.

VDD

Digital Power (6 Pins)

+3.3 V Power

There are six power supply pins that are used by the in-

ternal digital circuitry. All VDD pins must be connected

to a +3.3 V supply.

VSS

Digital Ground (8 Pins)

Ground

There are eight ground pins that are used by the inter-

nal digital circuitry.

DVDDD, DVDDP

PDX Block Power

+3.3 V Power

These pins supply power to the 100 Mbps Physical

Data Transceiver (PDX) block. They must be con-

nected to a +3.3 V ±5% source. These pins require

careful decoupling to ensure proper device perfor-

mance.

DVDDRX, DVDDTX

I/O Buffer Power

+3.3 V Power

These pins supply power to the MLT-3/PECL/10BASE-

T input/output buffers. They also supply the MLT-3 cir-

cuits (equalizer, etc.) of the network port. They must be

connected to a +3.3 V ±5% source. These pins require

careful decoupling to ensure proper device perfor-

mance.

DVDDA

Analog PLL Power

+3.3 V Power

This pin supplies power to the IREF current reference

circuit and the 10BASE-T analog PLL. They must be

connected to a +3.3 V ±5% source. These pins require

careful decoupling to ensure proper device perfor-

mance.

DVSSX

All Blocks

Ground

These pins are the ground connection for all blocks of

the device except the PDX block. They must be directly

connected to the common external ground plane.

DVSSD, DVSSP

PDX Ground

Ground

These pins are the ground connection for the Physical

Data Transceiver (PDX) block. They must be directly

connected to the common external ground plane.

DVDDCO

Crystal

+3.3 V Power

This pin supplies the power to the Crystal circuit.

AM79C975VCW Datasheet(PDF) 38 Page - Advanced Micro Devices

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