Datasheet > AM7992BDC

AM7992BDC

更新时间： 2024-10-28 22:47:47

品牌	Logo	应用领域
超微 - AMD		/
页数	文件大小	规格书
27页	222K
描述
Serial Interface Adapter (SIA)

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中文翻译

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数据手册

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AM7992BDC 数据手册

FINAL

Am7992B

Serial Interface Adapter (SIA)

DISTINCTIVE CHARACTERISTICS

■ CompatiblewithlEEE802.3/Ethernet/Cheapernet

■ Input signal conditioning rejects transient noise

— Transients <10 ns for collision detector inputs

— Transients <20 ns for carrier detector inputs

speciﬁcations

■ Crystal/TTL oscillator-controlled Manchester

encoder

■ Receiver decodes Manchester data with worst

case ±19 ns of clock jitter (at 10 MHz)

■ Manchester decoder acquires clock and data

within four bit times with an accuracy of ±3 ns

■ TTL-compatible host interface

■ Transmit accuracy +0.01% (without adjustments)

■ Guaranteed carrier and collision detection

squelch threshold limits

— Carrier/collision detected for inputs greater than

–275 mV

— No carrier/collision for inputs less than –175 mV

GENERAL DESCRIPTION

The Am7992B Serial Interface Adapter (SIA) is a

Manchester encoder/decoder compatible with IEEE

802.3, Cheapernet, and Ethernet speciﬁcations. In an

IEEE 802.3/Ethernet application, the Am7992B inter-

faces the Am7990 Local Area Network Controller for

Ethernet (LANCE) to the Ethernet transceiver device,

acquires clock and data within four bit times, and de-

codes Manchester data with worst case ±19 ns phase

jitter at 10 MHz. SIA provides both guaranteed signal

threshold limits and transient noise suppression cir-

cuitry in both data and collision paths to minimize false

start conditions.

BLOCK DIAGRAM

Receive Data (RX)

Manchester

Receive+

Data

Decoder

Receiver

Receive Clock (RCLK)

Noise

Reject

Filter

Receive–

Carrier

Carrier Present (RENA)

Detect

Collision+

Collision–

Noise

Reject

Filter

Collision

Collision (CLSN)

Detect

Transmit+

Transmit–

Transmit Data (TX)

Manchester

Encoder

Transmit Enable (TENA)

Transmit Clock (TCLK)

XTAL₁

XTAL₂

Crystal

OSC

20 MHz

03378I-1

Publication# 03378 Rev: I Amendment/0

Issue Date: May 1993

12 3 4 5 6 7...27

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