參數(shù)資料
型號(hào)： AM79C981JC
廠商： ADVANCED MICRO DEVICES INC
元件分類(lèi)： 網(wǎng)絡(luò)接口
英文描述： Integrated Multiport Repeater Plus⑩ (IMR+⑩)
中文描述： DATACOM, ETHERNET TRANSCEIVER, PQCC84
封裝： PLASTIC, LCC-84
文件頁(yè)數(shù)： 1/40頁(yè)
文件大?。?/td> 347K
代理商： AM79C981JC
PRELIMINARY
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.
Publication#
17306
Issue Date:
January 1999
Rev:
B
Amendment/
0
1-
71
Am79C981
Integrated Multiport Repeater Plus (IMR+)
DISTINCTIVE CHARACTERISTICS
Enhanced version of AMD’s Am79C980
Integrated Multiport Repeater (IMR) chip
with the following enhancements:
— Additional management port features
—
Minimum
mode provides support for an extra
four LED outputs per port for additional status in
non-intelligent repeater designs
— Pin/socket-compatible with the Am79C980
IMR chip
— Fully backward-compatible with existing IMR
device designs
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Interfaces directly with the Am79C987 HIMIB
device to build a fully managed multiport
repeater
CMOS device features high integration and low
power with a single +5 V supply
Repeater functions comply with IEEE 802.3
Repeater Unit specifications
Eight 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
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10BASE-F and/or Fiber Optic Inter-Repeater
Link (FOIRL) segments
On-board PLL, Manchester encoder/decoder,
and FIFO
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
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GENERAL DESCRIPTION
The Integrated Multiport Repeater Plus (IMR+) chip is a
VLSI circuit that provides a system-level solution to de-
signing 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 with the 10BASE-T standard. The Am79C981
provides 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, thereby providing an eco-
nomical solution to networking by allowing the use 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 IMR+ devices through
their expansion ports, minimizing the total cost per re-
peater port. Furthermore, a general-purpose attach-
ment 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. Net-
work management and test functions are provided
through TTL-compatible I/O pins.
The IMR+ device interfaces directly with AMD’s
Am79C987 Hardware Implemented Management In-
formation Base (HIMIB) chip to build a fully managed
multiport repeater as specified by the IEEE 802.3
(Layer Management for 10 Mb/s Baseband Repeaters)
standard. When the IMR+ and HIMIB devices are
interconnected, complete repeater and per-port statis-
tics are maintained and can be accessed on demand
using a simple 8-bit parallel interface.
相關(guān)PDF資料
PDF描述
AM79C982 basic Integrated Multiport Repeater (bIMR)
AM79C982-4JC basic Integrated Multiport Repeater (bIMR)
AM79C982-8JC basic Integrated Multiport Repeater (bIMR)
AM79C983AKC Integrated Multiport Repeater 2 (IMR2⑩)
AM79C984 enhanced Integrated Multiport Repeater (eIMR⑩)
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
AM79C982 制造商:AMD 制造商全稱(chēng):Advanced Micro Devices 功能描述:basic Integrated Multiport Repeater (bIMR)
AM79C982-4JC 制造商:Advanced Micro Devices 功能描述:LAN HUB CONTROLLER, 84 Pin, PLCC
AM79C982-8JC 制造商:AMD 制造商全稱(chēng):Advanced Micro Devices 功能描述:basic Integrated Multiport Repeater (bIMR)
AM79C983 制造商:未知廠家 制造商全稱(chēng):未知廠家 功能描述:Am79C983 Datasheet? 348KB (PDF) Integrated Multiport Repeater 2 IMR2 ?
AM79C983A 制造商:AMD 制造商全稱(chēng):Advanced Micro Devices 功能描述:Integrated Multiport Repeater 2 (IMR2⑩)
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