AM79C982 datasheet(13/26 Pages) AMD

部件名	AM79C982

功能描述	basic Integrated Multiport Repeater (bIMR)

PDF	26 Pages

Scroll/Zoom	100%

制造商	AMD [Advanced Micro Devices]

网页	http://www.amd.com

标志

13 / 26 page

AMD

PRELIMINARY

1–15

Am79C982

ARBITER

Am79C982

bIMR 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

Am79C982

bIMR Chip

Am79C982

bIMR Chip

Bus transceivers needed

if DAT and JAM buses

exceed 100 pF loading.

DIR

Note 1

Note 1:

Direction

DIR

→ A

LOW

→ B

HIGH

19406B-6

REQ2 REQ3 REQ1

Figure 1. Multiple bIMR Devices

Modular Repeater Design

The expansion port of the bIMR 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 repeat-

er module performs the local arbitration function for the

bIMR devices on that module, and provides signals to

the backplane for use by a global arbiter.

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