GA1086

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4

Multi-Processor Systems

The GA1086 can be effectively used to distribute clocks

in RISC- or CISC-processor-based systems. Its 10

outputs support both single- and multi-processor

systems. Following are three representative

configurations which show how the 10 outputs can be

used to synchronize the operation of CPU cache and

memory banks operating at different speeds.

CPU 1

CACHE

MEMORY

CONTROL

LOGIC

(66 MHZ)

SLOW

MEMORY

CONTROL

LOGIC

(33 MHZ)

CPU 2

CACHE

SYSTEM

CLOCK

GA1086

R

R

R

R

R

FBOUT

Q1

Q2

Q3

Q4

Q5

Q6

Q7

Q8

Q9

Q/2

R

R

R

R

R

R

FBIN

CLK

S2

S1

S0

LOW

HIGH

HIGH

Figure 4. Clocking a Dual-CPU System

Figure 4 depicts a 2-CPU system in which the

processors and associated peripherals are operating at

66 MHz. Each of the nine outputs operating at 66 MHz

are fully utilized to drive the appropriate CPU, cache,

and memory control logic. The 33 MHz output is used

to synchronize the operation of the slower memory

bank to the rest of the system.