AM79C985 datasheet, PDF - EEWORLD Datasheet

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AM79C985: Descriptionenhanced Integrated Multiport Repeater Plus (eIMR+⑩); File Size243KB，48 Pages; ManufacturerAMD; Websitehttp://www.amd.com

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AM79C985 Overview

enhanced Integrated Multiport Repeater Plus (eIMR+⑩)

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PRELIMINARY

Am79C985

enhanced Integrated Multiport Repeater Plus (eIMR+™)

DISTINCTIVE CHARACTERISTICS

Repeater functions compliant with IEEE 802.3

Repeater Unit speciﬁcations

Direct interface with the Am79C987 Hardware

Implemented Management Information Base

(HIMIB™) device for building a basic managed

multiport repeater

Full software backwards compatibility with

existing hub designs using Integrated Multiport

Repeater Plus (IMR+™)/HIMIB devices

Network management and optional feature

accessibility through a dedicated serial

management port

Four integral 10BASE-T transceivers with on-

chip ﬁltering eliminating the need for external

ﬁlter modules on the 10BASE-T transmit-data

(TXD) and receive-data (RXD) lines

One Reversible Attachment Unit Interface

(RAUI™) port used either as a standard IEEE-

compliant AUI port for connection to a Medium

Attachment Unit (MAU) or a reversed port for

direct connection to a Media Access Controller

(MAC)

Low cost suitable for managed multiport

repeater designs

Number of repeater ports easily expandable

with support for up to seven eIMR+ devices

without the need for an external arbiter

All ports capable of being individually isolated

(partitioned) in response to excessive collision

conditions or fault conditions

Flexible LED support for individual port status

and network utilization LEDs

Programmable extended distance mode on RXD

lines allowing connection to cables longer than

100 meters

Link Test function and Link Test pulse

transmission capable of being disabled through

the management port allowing devices that do

not implement the Link Test function to work

with the eIMR+ device

Programmable automatic polarity detection and

correction option permitting automatic

recovery from wiring errors

Full amplitude and timing regeneration for

retransmitted waveforms

CMOS device with a single +5-V supply

GENERAL DESCRIPTION

The enhanced Integrated Multiport Repeater Plus

(eIMR+) device is a VLSI integrated circuit that pro-

vides a system-level solution to designing managed

multiport repeaters. The device integrates the repeater

functions speciﬁed in Section 9 of the IEEE 802.3

standard and Twisted Pair Transceiver functions com-

plying with the 10BASE-T standard.

The eIMR+ device provides four Twisted Pair (TP) ports

and one reversible AUI (RAUI) port for direct connec-

tion to a MAC. The total number of ports per repeater

unit can be increased by connecting multiple eIMR+

devices through their expansion ports, hence, minimiz-

ing the total cost per repeater port.

The eIMR+ device also provides a connection to the

Am79C987 HIMIB device. The HIMIB device monitors

all the necessary counters, attributes, actions, and

notiﬁcations speciﬁed by IEEE 802.3, Section 19

(Layer Management for 10 Megabit per second (Mbps)

Baseband Repeaters). When the eIMR+ and HIMIB

devices are used together as a chip set, they provide a

cost-effective solution to the problem of designing

10BASE-T basic managed multiport repeaters.

The device is fabricated in CMOS technology and

requires a single +5-V supply.

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#

20651

Rev:

Amendment/0

Issue Date:

January 1998

P R E L I M I N A R Y

TABLE OF CONTENTS

DISTINCTIVE CHARACTERISTICS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

GENERAL DESCRIPTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

BLOCK DIAGRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

ORDERING INFORMATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

Standard Products . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

RELATED PRODUCTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

CONNECTION DIAGRAMS (PL 084) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

CONNECTION DIAGRAMS (PQR100) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

LOGIC SYMBOL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

LOGIC DIAGRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

PIN DESIGNATIONS (PL084) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

Listed by Pin Number. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

PIN DESIGNATIONS (PQR100) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

Listed by Pin Number. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

PIN DESCRIPTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

AUI Port . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

Twisted Pair Ports . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

Expansion Bus . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

Management Port . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

LED Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

Miscellaneous Pins . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

FUNCTIONAL DESCRIPTION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

Basic Repeater Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

Repeater Function. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

Signal Regeneration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

Jabber Lockup Protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

Collision Handling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

Fragment Extension . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

Auto Partitioning/Reconnection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

Detailed Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

Reset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

AUI Port . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

TP Port Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

Twisted Pair Transmitters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

Connection to Alternate Media . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

Twisted Pair Receivers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

Link Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

Polarity Reversal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

Visual Status Monitoring (LED) Support . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

Network Activity Display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

Expansion Bus Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

Internal Arbitration Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

IMR+ Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

Management Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

eIMR+ /HIMIB Interconnection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

Management Port Interface. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

Command/Response Timing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

Port Activity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

Management Commands . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

SET (Write Commands) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26

Get (Read Commands) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

SYSTEMS APPLICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31

eIMR+ to TP Port Connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31

Twisted Pair Transmitters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31

Twisted Pair Receivers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31

MAC Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32

Am79C985

AM79C985 Related Products

	AM79C985	Am79C985JC	Am79C985KCW
Description	enhanced Integrated Multiport Repeater Plus (eIMR+⑩)	enhanced Integrated Multiport Repeater Plus (eIMR+⑩)	enhanced Integrated Multiport Repeater Plus (eIMR+⑩)
Is it Rohs certified?	-	incompatible	incompatible
Maker	-	AMD	AMD
Parts packaging code	-	LCC	QFP
package instruction	-	QCCJ, LDCC84,1.2SQ	QFP, QFP84,.7X.9
Contacts	-	84	100
Reach Compliance Code	-	unknown	unknow
JESD-30 code	-	S-PQCC-J84	R-PQFP-G100
JESD-609 code	-	e0	e0
length	-	29.2862 mm	20 mm
Number of functions	-	1	1
Number of terminals	-	84	100
Maximum operating temperature	-	70 °C	70 °C
Package body material	-	PLASTIC/EPOXY	PLASTIC/EPOXY
encapsulated code	-	QCCJ	QFP
Encapsulate equivalent code	-	LDCC84,1.2SQ	QFP84,.7X.9
Package shape	-	SQUARE	RECTANGULAR
Package form	-	CHIP CARRIER	FLATPACK
Peak Reflow Temperature (Celsius)	-	NOT SPECIFIED	NOT SPECIFIED
power supply	-	5 V	5 V
Certification status	-	Not Qualified	Not Qualified
Maximum seat height	-	4.57 mm	3.35 mm
Maximum slew rate	-	350 mA	350 mA
Nominal supply voltage	-	5 V	5 V
surface mount	-	YES	YES
technology	-	CMOS	CMOS
Telecom integrated circuit types	-	ETHERNET TRANSCEIVER	ETHERNET TRANSCEIVER
Temperature level	-	COMMERCIAL	COMMERCIAL
Terminal surface	-	Tin/Lead (Sn/Pb)	Tin/Lead (Sn/Pb)
Terminal form	-	J BEND	GULL WING
Terminal pitch	-	1.27 mm	0.65 mm
Terminal location	-	QUAD	QUAD
Maximum time at peak reflow temperature	-	NOT SPECIFIED	NOT SPECIFIED
width	-	29.2862 mm	14 mm

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