AM79C978VCSLASHW datasheet(32/261 Pages) AMD

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Am79C978

Table 2.

External Clock/Crystal Select

XTAL1

Crystal Oscillator In

Input

The internal clock generator utilizes either a 20-MHz

crystal that is attached to pins XTAL1 and XTAL2 or a

60-MHz clock source connected to XTAL1. This pin is

not 5 V tolerant, and the 60 MHz clock source must be

from a 3.3 V source.

XTAL2

Crystal Oscillator Out

Output

The internal clock generator utilizesd a 20-MHz crystal

that is attached to pins XTAL1 and XTAL2.

Power Supply

VDDB

I/O Buffer Power (5 Pins)

+3.3 V Power

These pins are the power supply pins that are used by

the input/output buffer drivers. All VDDB pins must be

connected to a +3.3 V supply.

VDD_PCI

PCI I/O Buffer Power (9 Pins)

+3.3 V Power

These pins are the 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 sup-

ply.

VSSB

I/O Buffer Ground (15 Pins)

Ground

These pins are the ground pins that are used by the

input/output buffer drivers.

VDD

Digital Power (7 Pins)

+3.3 V Power

These pins are the power supply pins that are used by

the internal digital circuitry. All VDD pins must be con-

nected to a +3.3 V supply.

VSS

Digital Ground (7 Pins)

Ground

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

nal digital circuitry.

DVDDD

10BASE-T PDX Block Power

+3.3 V Power

This pin supplies power to the 10 Mbps Transceiver

block. It must be connected to a +3.3 V ±300 mV

source. This pin requires careful decoupling to ensure

proper device performance.

DVDDRX, DVDDTX

10BASE-T I/O Buffer Power

+3.3 V Power

These pins supply power to the 10BASE-T input/output

buffers. They must be connected to a +3.3 V ±300 mV

source. These pins require careful decoupling to en-

sure proper device performance.

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 ±300 mV source. These pins re-

quire careful decoupling to ensure proper device per-

formance.

DVSSX, DVSSA

10BASE-T PDX Analog Ground

Ground

These pins are the ground connection for the analog

section within the Physical Data Transceiver (PDX)

block.

DVSSD

10BASE-T PDX Digital Ground

Ground

This pin is the ground connection for the digital logic

within the PDX block.

VDDCO

Crystal

+3.3 V Power

This pin supplies power to the crystal circuit.

VDDHR

HomePNA Digital Power

+3.3 V Power

These pins are the digital power supply pins that are

used by the internal digital circuitry for the HomePNA

block. They must be connected to a +3.3 V source.

VSSHR

HomePNA Analog Ground

Ground

This pin is the ground connection for the analog section

within the HomePNA block.

DVDDA_HR

HomePNA Analog Power

+3.3 V Power

This pin supplies power to the analog section of the

HomePNA block. It must be connected to a +3.3 V

±300 mV source. This pin requires careful decoupling

to ensure proper device performance.

Input Pin

Output

XCLK/XTAL

Clock Source

XTAL1

XTAL2

20-MHz Crystal

XTAL1

Don’t Care

60-MHz Oscillator/

External CLK

Source

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