AM7992B datasheet(1/27 Pages) AMD

部件名	AM7992B

功能描述	Serial Interface Adapter (SIA)

PDF	27 Pages

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制造商	AMD [Advanced Micro Devices]

网页	http://www.amd.com

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FINAL

Publication# 03378

Rev: I

Amendment/0

Issue Date: May 1993

1

Am7992B

Serial Interface Adapter (SIA)

DISTINCTIVE CHARACTERISTICS

s Compatible with lEEE 802.3/Ethernet/Cheapernet

speciﬁcations

s Crystal/TTL oscillator-controlled Manchester

encoder

s Manchester decoder acquires clock and data

within four bit times with an accuracy of

±3 ns

s 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

s Input signal conditioning rejects transient noise

— Transients <10 ns for collision detector inputs

— Transients <20 ns for carrier detector inputs

s Receiver decodes Manchester data with worst

case

±19 ns of clock jitter (at 10 MHz)

s TTL-compatible host interface

s Transmit accuracy +0.01% (without adjustments)

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

03378I-1

Manchester

Decoder

Data

Receiver

Noise

Reject

Filter

Carrier

Detect

Noise

Reject

Filter

Collision

Detect

Manchester

Encoder

Crystal

OSC

Receive Data (RX)

Receive Clock (RCLK)

Carrier Present (RENA)

Collision (CLSN)

Transmit Data (TX)

Transmit Enable (TENA)

Transmit Clock (TCLK)

20 MHz

XTAL

1

XTAL

2

Receive+

Receive–

Collision+

Transmit+

Transmit–

Collision–

类似零件编号 - AM7992B

制造商	部件名	数据表	功能描述
Advanced Micro Devices	AM7996	179Kb / 18P	IEEE 802.3/Ethernet/Cheapernet Transceiver
	AM7996DC	179Kb / 18P	IEEE 802.3/Ethernet/Cheapernet Transceiver
	AM7996DCB	179Kb / 18P	IEEE 802.3/Ethernet/Cheapernet Transceiver
	AM7996DCTR	179Kb / 18P	IEEE 802.3/Ethernet/Cheapernet Transceiver
	AM7996EVAL-HW	39Kb / 2P	Ethernet/Cheapernet Transceiver Evaluation Kit

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