am79c982 Advanced Micro Devices, am79c982 Datasheet - Page 13

• Manufacturer Part Number: am79c982
• Description: Basic Integrated Multiport Repeater Bimr
• Manufacturer: Advanced Micro 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
ASYNC
RESET
Note 1:
Direction
B
A
A
B
D
1/2 ’74
D FF
XTAL
OSC.
CK
LOW
HIGH
Q
DIR
Figure 1. Multiple bIMR Devices
PRELIMINARY
Am79C982
ACK
COL
RST
X1
REQ2 REQ3 REQ1
COL
ACK
ACK
COL
RST
X1
ACK
COL
RST
X1
Am79C982
Am79C982
Am79C982
ARBITER
bIMR Chip
bIMR Chip
bIMR Chip
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.
REQ
REQ
1
2
3
REQ
DAT
DAT
DAT
REQ
ACK
JAM
JAM
JAM
Bus transceivers needed
if DAT and JAM buses
exceed 100 pF loading.
A
DIR
B
AMD
Note 1
19406B-6
1–15