AM7996PCB datasheet(6/18 Pages) AMD

6 / 18 page

AMD

Am7996

APPLICATIONS

The Am7996 is compatible with Ethernet Version 2 and

IEEE 802.3 10BASE5 and 10BASE2 applications. (See

Figure 1).

Local

CPU

Local

Memory

Am7990

LANCE

Am7992B

SIA

Local Bus

Am7996

Transceiver

Power

Supply

Ethernet

Coax

RG58

BNC "T"

Ethernet

DTE

AUI

Cable

MAU

Tap

AUI - Attachment Unit Interface

DTE - Data Terminal Equipment

MAU - Media Access Unit

Cheapernet

Local

CPU

Local

Memory

Am7990

LANCE

Am7992B

SIA

DTE

Am7996

Transceiver

Power

Supply

Local Bus

07506E-4

Figure 1. Typical Ethernet Node

Table 1.

Transmit Mode Collision Detect

Function Table

MAU

Mode of Operation

< 2

= 2

> 2

Transmitting

Yes

Not Transmitting

May

Yes

Number of Transmitters

Table 2.

IEEE 802.3 Recommended Transmit

Mode Collision Detect Thresholds

No Detect

Must Detect

10BASE5, Ethernet

–1.492 V

–

10BASE2, Cheapernet

–1.404 V

–1.782 V

IEEE 802.3

Threshold Voltage Level

Table 3.

Receive Mode Collision Detect

Function Table

MAU

Mode of Operation

< 2

= 2

> 2

Transmitting

Yes

Not Transmitting

Yes

Number of Transmitters

Table 4.

IEEE 802.3 Recommended Receive

Mode Collision Detect Thresholds

No Detect

Must Detect

10BASE5, Ethernet

–1.492 V

–1.629 V

10BASE2, Cheapernet

–1.404 V

–1.581 V

IEEE 802.3

Threshold Voltage Level

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