(b) Calculation of auto refresh time
The automatic refresh time of the CPU shared memory is calculated in the following equation.
1) For Basic model QCPU
(Auto refresh time)
= (N1 + (No. of transmission word points)
(N3 + (No. of other CPUs)
• The number of received words is the sum of the numbers of words transmitted by the other CPUs.
• For N1 to N5, use the values in Table5.3.
Basic model QCPU
Q00CPU
Q01CPU
2) For High Performance model QCPU/Process CPU
(Auto refresh time) = (N1 + (No. of reception word points)
• The number of received words is the sum of the numbers of words transmitted by the other CPUs.
• Use the values in Table5.4 for N1 to N4.
High Performance model QCPU/
Process CPU
Q02CPU
Q02HCPU, Q06HCPU, Q12HCPU,
Q25HCPU
Q02PHCPU, Q06PHCPU, Q12PHCPU,
Q25PHCPU
CHAPTER5 PROCESSING TIME OF QCPU IN MULTIPLE CPU SYSTEM
N4 + (No. of reception word points)
(Example) When No. of CPU is set to 3 and the host CPU is CPU No. 1
The number of received words is the sum of the numbers of
words sent by CPUs No.2 to No.3.
Table5.3 Auto refresh time
N1
63 s
57 s
+ (N3 + (No. of transmission word points)
(Example) When No. of CPU is set to 4 and the host CPU is CPU No. 1
The number of received words is the sum of the numbers of
words sent by CPUs No.2 to No.4.
Table5.4 Auto refresh time
N1
82 s
27 s
N2)) +
N5) (µs)
N2
N3
1.13 s
63 s
1.03 s
57 s
N2)
(No. of other CPUs)
N4) (µs)
N2
N3
0.52 s
106 s
0.44 s
27 s
N4
N5
161 s
0.88 s
146 s
0.80 s
N4
0.17 s
0.08 s
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