AM79C989JC datasheet(28/37 Pages) AMD

28 / 37 page

Am79C989

PRELIMINARY

SYSTEM APPLICATIONS

10 Mbps Ethernet Switch

The QuEST device is targeted for use in 10BASE-T

switching applications. The QuEST device provides

four 10BASE-T receive and transmit ports.

Optionally, one of the 10BASE-T ports can be repro-

grammed as an AUI. The four Ethernet ports are multi-

plexed into the QuASI interface which interfaces to a

switching subsystem. The QuEST device provides

10BASE-T ﬁlterless technology and a reduced pin

count which enables high levels of switch integration.

Figure 1.

QuEST Device Application Diagram

Note: If QINT and the AUI port are used, a special circuit (not shown) is needed for PCI. Optional

QuEST

RJ45 Connector

AUI Connector

(Optional)

100

Ω

110

Ω

100

Ω

110

Ω

100

Ω

100

Ω

110

Ω

110

Ω

40.2

Ω

40.2

Ω

TXD0+

TXD0-

RXD0+

RXD0-

TXD1-

RXD1+

RXD1-

TXD2+

TXD2-

RXD2+

RXD2-

TXD3+

TXD3-

RXD3+

RXD3-

TXD1+

PCI/CI+

CI-

DI+

DO+

DI-

DO-

1:1

REXT

QTX_EN

QTX_DATA

QRX_DATA

QRX_VALID

QCLSN

QRX_CRS

SCLK

QRST/STRB

QINT

MDC

MDIO

MDC

MDIO

INT

TX_EN

TX_DATA

RCV_DATA

RCV_DV

CLSN

RCV_CRS

SCLK

RESET

Shared

Signals

Switch

Interface

VDD

VDD VDD

VDD

40.2

Ω

40.2

Ω

0.01

µF to

10.1

µF

0.01

µF to

10.1

µF

21173B-5

10K resistors are used to set internal address match for Management Address.

AM79C989JC Datasheet(PDF) 28 Page - Advanced Micro Devices

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