GA1086
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.
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.
Figure 4. Clocking a Dual-CPU System
R
CPU 1
CACHE
R
Q1
Q2
Q3
Q4
R
R
R
MEMORY
CONTROL
LOGIC
(66 MHZ)
FBIN
SYSTEM
CLOCK
CLK
FBOUT
GA1086
R
Q5
R
Q6
Q7
R
R
R
Q9
R
Q/2
SLOW
MEMORY
CONTROL
LOGIC
(33 MHZ)
CPU 2
CACHE
LOW
HIGH
HIGH
S2
S1
S0
Q8
4
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