Run length with modelsim

[srinivasbakki]

Hi,
Am trying to debug my circuit with ModelSim. Am a beginner at this. Am using Modelsim SE PLUS 6.5.Wanted to know how to change the run length for a wave capture. With the Simulate->Runtime options->Default run doesnt seem to change the length. It always goes back to 1 ms. I also tried editing it directly in the box but that doesnt change either. I want to drive my clock at 100MHZ. so i set the drive like this :
Force clk 0 0 ns, 1 5 ns -r 10 ns. I expect this command to set the clock to '0' at 0 ns and then '1' at 5 ns and then repeat this over the period 10 ns which amounts to 100MHZ.
But the command gives me an error saying "repeat should be atleast 1 ms" I suspect this is because the runlength is set at 1 ms.
If i omit the ns from the command then the clock is simulated over 1 ms period.
Can somebody help with this ?

Srinivas

 

[TrickyDicky]

just type in the command window:

run X ns/us/ms

or if you have a testbench that can stop itself:

run -all

 

[srinivasbakki]

You mean "run 10 ns" ?
Ok, i'll phrase my question the other way - show me the commands to simulate a 100MHZ clock. Provided you have the runlength set to 1ms by default.

I saw on google that most of them get the simulator launched with default setting of 100ns on their runlength box. I dont know for what reason my simulator launches with 1ms runlength.

Thanks,
Srinivas

 

[TrickyDicky]

Modelsim shouldnt really be generating a clock. Your testbench should be.