AM79C981 datasheet(12/40 Pages) AMD

12 / 40 page

AMD

PRELIMINARY

1–82

Am79C981

ARBITER

Am79C981

IMR+ Chip

ACK

COL

RST

ACK

COL

RST

DAT

JAM

REQ

DAT

JAM

ACK

COL

RST

DAT

JAM

D FF

XTAL

OSC.

ASYNC

RESET

1/2 ’74

COL

ACK

REQ

Am79C981

IMR+ Chip

Am79C981

IMR+ Chip

Bus transceivers needed

if DAT and JAM buses

exceed 100 pF loading.

DIR

Note 1

Note 1:

Direction

DIR

→ A

LOW

→ B

HIGH

17306B-5

REQ2 REQ3 REQ1

Figure 1. Multiple IMR+ Devices

Modular Repeater Design

The expansion port of the IMR+ chip also allows for

modular expansion. By sharing the arbitration duties be-

tween a backplane bus architecture and several sepa-

rate repeater modules one can build an expandable

repeater based on modular ‘plug-in’ cards. Each

repeater module performs the local arbitration function

for the IMR+ devices on that module, and provides sig-

nals to the backplane for use by a global arbiter.

For more detailed information, see AMD’s IEEE 802.3

Repeater Technical Manual, PID# 17314A.

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