am79c982 Advanced Micro Devices, am79c982 Datasheet
am79c982
Manufacturer Part Number
am79c982
Description
Basic Integrated Multiport Repeater Bimr
Manufacturer
Advanced Micro Devices
Datasheet
1.AM79C982.pdf
(26 pages)
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Am79C982
b asic Integrated Multiport Repeater (
DISTINCTIVE CHARACTERISTICS
GENERAL DESCRIPTION
The b asic Integrated Multiport Repeater ( b IMR™) chip
is a VLSI circuit that provides a system-level solution to
designing a compliant 802.3 repeater incorporating
10BASE-T transceivers. The device integrates the
Repeater functions specified by Section 9 of the
IEEE 802.3 standard and twisted-pair Transceiver
functions complying to the 10BASE-T standard. The
Am79C982-4 provides four and the Am79C982-8 pro-
vides eight integral twisted-pair medium attachment
units (MAUs), and an attachment unit interface (AUI)
port in an 84-pin plastic leaded chip carrier (PLCC).
A network based on the 10BASE-T standard uses un-
shielded twisted-pair cables, therefore providing an
economical solution to networking by allowing the use
Publication# 19406
Issue Date: January 1999
Fully backward-compatible with existing
IMR/IMR+ device non-managed hub designs
— Pin/socket-compatible with the Am79C980
Repeater functions comply with IEEE 802.3
Repeater Unit specifications
Four and eight 10BASE-T port options available
Low-cost, flexible solutions suitable for
non-managed repeater designs
Integral 10BASE-T transceivers utilize the
required predistortion transmission technique
Attachment unit interface (AUI) port allows
connectivity with 10BASE-5 (Ethernet) and
10BASE-2 (Cheapernet) networks, as well as
10BASE-F and/or Fiber Optic Inter-Repeater
Link (FOIRL) segments
Minimum mode facilitates LED implementation
and provides four LED display options for port
status
Built-in pulse stretching for carrier sense LED
display
On-board PLL, Manchester encoder/decoder,
LED display and FIFO
(IMR) and Am79C981 (IMR+) devices
PRELIMINARY
Rev: B Amendment/0
This document contains information on a product under development at Advanced Micro Devices. The
information is intended to help you evaluate this product. AMD reserves the right to change or discontinue
work on this proposed product without notice.
b
IMR)
of low-cost unshielded twisted-pair (UTP) cable or
existing telephone wiring.
The total number of ports per repeater unit can be in-
creased by connecting multiple b IMR devices through
their expansion ports, hence minimizing the total cost
per repeater port. Furthermore, a general-purpose
attachment unit interface (AUI) provides connection
capability to 10BASE-5 (Ethernet) and 10BASE-2
(Cheapernet) coaxial networks, as well as 10BASE-F
and/or Fiber Optic Inter-Repeater Link (FOIRL) fiber
segments. Network management and test functions
are provided through TTL-compatible I/O pins.
The device is fabricated in CMOS technology and
requires a single +5 V supply.
Expandable to increase number of repeater
ports
All ports can be separately isolated (partitioned)
in response to excessive collision conditions or
fault conditions
Network management and optional features are
accessible through a dedicated serial
management port
Twisted-pair Link Test capability conforming to
the 10BASE-T standard. The receive Link Test
function can be optionally disabled through the
management port to facilitate interoperability
with devices that do not implement the Link Test
function
Programmable option of Automatic Polarity
Detection and Correction permits automatic
recovery due to wiring errors
Full amplitude and timing regeneration for
retransmitted waveforms
Preamble loss effects eliminated by deep FIFO
CMOS device features high integration and low
power with a single +5 V supply
1-3
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