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DJLXT908LC

Universal 3.3V 10BASE-T and AUI Transceiver

Intel 

LXT908 — Universal 3.3V 10BASE-T and AUI Transceiver

3.2.2

Full Duplex Support

Figure 10 shows the LXT908 with a Texas Instruments 380C24 CommProcessor. The 380C24 is

compatible with Mode 4 (MD2:0 = Low, High, High). When used with the 380C24 or other full-

duplex-capable controllers, the LXT908 supports full-duplex Ethernet, effectively doubling the

available bandwidth of the network. In this application, the SQE function is enabled (DSQE tied

Low), and the LXT908 AUI port is not used.

Figure 10. Full-Duplex Operation

TMS380C24

20 pF

20 MHz

20 pF

3

TXD

TXEN

TXC

RXC

RXD

CSN

COLL

LPBK

*TEST0

OUTSEL0

1N914

CLKI

TXD

TEN

TCLK

RCLK

RXD

CD

COL

LBK

LEDC/FDE

1 10 KΩ

*Open Collector

Driver

PROGRAMMING

OPTIONS

4.7 KΩ

AUTOSEL

NTH

LI

DSQE

PAUI

MODE

SELECT

LINE STATUS

330 330 330

MD2

MD1

MD0

JAB

PLR

PAUI

CLKO

TPIN

TPIP

TPONB

TPONA

TPOPB

TPOPA

CIN

CIP

DON

DOP

1 1 : 1 16

100 Ω

3

14

11.5 Ω 1% 6 1 : 2 11

220pF

11.5 Ω 1% 8

9

RJ45

6

5

4

3

2

1

Half/Full Duplex Selection controlled by TMS380C24 Pins

1 Test0 and OUTSEL0.

2 Bias resistor RBIAS should be located close to the pin

and isolated from other signals.

The TMS380C26 may be substituted for dual network

3 support of 10BASE-T and Token Ring.

Green Red Red

LEDR

LEDT/PDN

LEDL

DIN

DIP

TEST

+3.3 V

VCC1

VCC2

RBIAS

GND1 GND2

2

12.4 kΩ

1%

0.1 µF

20

Datasheet

Document #: 249049

Revision #: 002

Rev. Date: June 19, 2001

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