From Real Time Systems Design And Analysis   Instruction Execution-Time Simulators   The determination of instruction
times requires more than just the information supplied in the CPU
manufacturer’s data books. It is also dependent on memory access times and
wait states, which can vary depending on the source region of the instruction or
data in memory. Some companies that frequently design real-time systems on
a variety of platforms use simulation programs to predict instruction execution
time and CPU throughput. Then engineers can input the CPU types, memory
speeds for each region of memory, and an instruction mix, and calculate total
instruction times and throughput.
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