AM79C971VCW datasheet(17/265 Pages) AMD

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Am79C971

PIN DESIGNATIONS

Listed By Group

Note:

1. Not including test features.

Listed By Driver Type

The following table describes the various types of out-

put drivers used in the Am79C971 controller. All IOL and

IOH values shown in the table apply to 5 V signaling.

See the DC Characteristics section for the values ap-

plying to 3.3 V signaling.

A sustained tri-state signal is a low active signal that is

driven high for one clock period before it is left floating.

DO, TDO, and TPO are differential output drivers. Their

characteristics and the one of the XTAL output are de-

scribed in the DC Characteristics section.

Pin Name

Pin Function

Type1

Driver

No. of Pins

Power Supplies

AVDDB

Analog I/O Buffer Power

AVSSB

Analog I/O Buffer Ground

VDD_PLL

Analog PLL Power

VSS_PLL

Analog PLL Ground

VDD

Digital Power

VSS

Digital Ground

VDDB

I/O Buffer Power

VSSB

I/O Buffer Ground

VDD_PCI

PCI I/O Buffer Power

Name

Type

IOL (mA)

IOH (mA)

Load (pF)

LED

-0.4

OMII1

Totem Pole

-4

OMII2

Totem Pole

-4

390

Totem Pole

-0.4

OD6

Open Drain

STS6

Sustained Tri-State

-2

TS3

Tri-State

-2

TS6

Tri-State

-2

TSMII

Tri-State

-4

470

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