PRELIMINARY

This document contains information on a product under development at Advanced Micro Devices. The information

is intended to help you evaluate this product. AMD reserves the right to change or discontinue work on this proposed

product without notice.

Publication# 19880

Rev: B Amendment/+2

Issue Date: November 1997

Am79C988A

Quad Integrated Ethernet Transceiver (QuIET™)

DISTINCTIVE CHARACTERISTICS

s Four independent 10BASE-T transceivers

compliant with IEEE 802.3 Section 14

(10BASE-T MAUs)

s Direct interface with AMD's Am79C983A IMR2™

repeater device

s On-chip filtering

— Eliminates external transmit and receive filters

— Meets IEEE 802.3 (Section 14.3) electrical

requirements

— Enables port switching when used with the IMR2

device

s Automatic polarity detection and correction

s Serial management interface allows transfer of

command and status data between the QuIET

device and a controller (IMR2 or other device)

s Standard Ethernet (Normal) and Full-Duplex

modes

s Extended distance option to accommodate

lines longer than 100 meters

s Test functions provided for Loopback, Link Test,

Reverse Polarity, and Jabber

s 44-pin PLCC CMOS device with a single 5-V

supply

GENERAL DESCRIPTION

The Am79C988A Quad Integrated Ethernet Transceiver

(QuIET) device consists of four independent 10BASE-T

transceivers which are compliant with the IEEE 802.3

Section 14 (

Medium Attachment Unit for 10BASE-T

Cabling)

standard. When

combined

with

AMD's

Integrated Multiport Repeater 2 (IMR2™) chip, the

QuIET device provides a system-level solution to

designing a managed 10BASE-T repeater.

The QuIET device includes on-chip filtering for both

transmit and receive functions, thus eliminating the

need for external filters. On-chip filtering meets IEEE

802.3 (Section 14.3) electrical requirements. The

QuIET device provides automatic polarity detection and

correction and can operate in either normal or full-

duplex mode.

The QuIET device interfaces directly with the Pseudo

AUI (PAUI™) ports on the IMR2 (Am79C983A) device

and can also be connected to standard AUI ports. Com-

mand and status data are exchanged with the IMR2

device via a serial management interface. Port switch-

ing can be easily implemented with the IMR2/QuIET

chipset to move individual ports between multiple Ether-

net segments under software control.

For application examples on building fully-managed

repeaters using the QuIET and IMR2 devices, refer to

AMD’s

IMR2 Technical Manual (PID 19898A).

The QuIET chip is packaged in a 44-pin plastic leaded

chip carrier (PLCC). The device is fabricated in CMOS

technology and requires a single 5-V supply.