AM79C940VCW datasheet(85/122 Pages) AMD

85 / 122 page

AMD

Am79C940

XMT

Filter

RCV

Filter

ANLG GND

ANLG +5 V

AVSS

AVDD

0.1

µF

Filter &

Transformer

Module

Note 1

Note 2

Am79C940

TXP+

TXD–

TXP–

TXD+

RXD+

RXD–

0.1

µF

LNKST

LINK OK

DGTL +5 V

RXPOL

RX POL OK

1.21K

Ω

100

Ω

61.9

Ω

422

Ω

61.9

Ω

422

Ω

DO–

DI+

DI–

CI+

CI–

DO+

Pulse

Transformer

Note 3

40.2

Ω

Optional

ANLG GND

0.1

µF

0.1

µF

DXCVR

Optional

Disable

10BASE2 DC/DC

Convertor

10BASE2 MAU

COAX

TAP

(BNC)

See Am7996 Data Sheet

for component and

implementation details

Active High

Active Low

RJ45

Connector

40.2

Ω

40.2

Ω

40.2

Ω

TD+

TD–

RD+

RD–

16235C-17

Am7996

Notes:

1. Compatible filter modules, with a brief description of package type and features are included in the following section.

2. The resistor values are recommended for general purpose use and should allow compliance to the 10BASE-T specification for template fit and

jitter performance. However, the overall performance of the transmitter is also affected by the transmit filter configuration. All resistors are

1%.

3. Compatible AUI transformer modules, with a brief description of package type and features are included in the following section.

4. Active High indicates the external convertor should be turned off. The Disable Transceiver (DXCVR) output is used to indicate the active

network port. A high level indicates the 10BASE-T port is selected and the AUI port is disabled. A low level indicates the AUI port is selected

and the Twisted Pair interface is disabled.

Active Low: indicates the external converter should be turned off. The LNKST output can be used to indicate the active network

port. A high level indicates the 10BASE-T port is in the Link Fail state, and the external convertor should be on. A low level indicates the

10BASE-T port is in the Link Pass state, and the external convertor should be off.

1:1

Note 4

10BASE-T and 10BASE2 Configuration of Am79C940

AM79C940VCW Folha de dados(PDF) 85 Page - Advanced Micro Devices

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