Datasheet > AM7996PCTR

AM7996PCTR

更新时间： 2024-10-28 22:47:47

品牌	Logo	应用领域
超微 - AMD		以太网
页数	文件大小	规格书
18页	179K
描述
IEEE 802.3/Ethernet/Cheapernet Transceiver

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AM7996PCTR 数据手册

FINAL

Am7996

IEEE 802.3/Ethernet/Cheapernet Transceiver

■ Noise rejection ﬁlter ensures that only valid data

DISTINCTIVE CHARACTERISTICS

is transmitted onto the network

■ Compatible with Ethernet Version 2 and

IEEE 802.3 10BASE-5 and10BASE-2

speciﬁcations

■ Collision detection on both transmit and receive

data

■ Collision detect threshold levels adjustable for

■ Pin-selectable SQE Test (heartbeat) option

other networking applications

■ Internal jabber controller prevents excessive

transmission time

GENERAL DESCRIPTION

The Am7996 IEEE 802.3/Ethernet/Cheapernet Trans-

ceiver supports Ethernet Version 2, IEEE 802.3

10BASE-5 and IEEE 802.3 10BASE-2—Cheapernet)

transceiver applications. Transmit, receive, and colli-

sion detect functions at the coaxial media interface to

the data terminal equipment (DTE) are all performed by

this single device.

connected to the DTE. Transceiver power and ground in

both applications are isolated from that of the DTE.

The Am7996’s tap driver provides controlled skew and

current drive for data signaling onto the media. The jabber

controller prevents the node from transmitting exces-

sively. While transmitting, collisions on the media are de-

tected if one or more additional stations are transmitting.

In an IEEE 802.3 (10BASE-5)/Ethernet application, the

Am7996 interfaces the coaxial (0.4″ diameter) media to the

DTE through an isolating pulse transformer and the 78 Ω

attachment unit interface (AUI) cable. In IEEE 802.3

10BASE-2—Cheapernet applications, the Am7996 typi-

cally resides inside the DTE with its signals to the DTE iso-

lated and the coaxial (0.2″ diameter) media directly

The Am7996 features an optional SQE Test function

that provides a signal on the Cl pair at the end of every

transmission. The SQE Test indicates the operational

status of the Cl pair to the DTE. It can also serve as an

acknowledgment to the node that packet transmission

onto the coax was completed.

BLOCK DIAGRAM

Carrier

Detect

Circuit

Receive

Data

Input

Buffer

Control

Logic

Line

Driver

DI+

DI–

Amplifier

RXT

Collision

Detect

Circuit

Line

Driver

CI+

CI–

Control

Logic

Jabber

Timer

SQE Test

Generator

Transmit

Squelch

DO+

DO–

Transmit

Data

Amplifier

Tap

Driver

Input

Buffer

TXT

SQE TEST

07506E-1

Publication# 07506 Rev: E Amendment/0

Issue Date: May 1994

12 3 4 5 6 7...18

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