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I was trying to implement a 1Hz clock using 100MHz clock.
However, In the xilinx ISE, ISIM execution speed is around 5ms per second.
This is too slow for my project.
How do I modify default execution speed?

Peter Hwang
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  • Normally one does not simulate a second. Most designs have a SIM_SPEEDUP generic to reduce cycles or time in simulation. There is no gain for waiting 100,000,000 cycles than just waiting for 100 cycles. – Paebbels Feb 10 '15 at 08:17

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Have you purchase a full ISE license? It's said that iSim is faster in the unlocked version ...

You could use an alternative simulator:

  • ModelSim / QuestaSim
  • GHDL
Paebbels
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