242
Input
signal
Output
signal
Cycle
Cycle time
Input refresh
Output refresh
I/O response time
CPU reads
input signal
CPU writes
output signal
Input ON delay
Overseeing
Cycle time
Output ON delay
Maximum I/O response time = input ON delay + (cycle time x 2) + overseeing
time + output ON delay
The data in the following table would produce the minimum and maximum
cycle times shown calculated below.
Input ON-delay
1.5 ms
Cycle time
20 ms
Input refresh time
0.23 ms
Overseeing time
3.0 ms
Output ON-delay
15 ms
Minimum I/O response time = 1.5 + 20 + 0.23 + 3.0 +15 = 39.73 ms
Maximum I/O response time = 1.5 + (20 x 2) + 3.0 +15 = 59.5 ms
Calculation Example
I/O Response Time
Section 6-4
