Problem with using Simulate Behavioral Model in Modelsim

[ee_wmkab]

Modelsim help

Dear ALL,

I am new to FPGA and I am using Xilinx ISE for development and Modelsim for simulation. After I have created the testbench waveform file for simulation. I will use the "Simulate Behavioral Model" by Modelsim. I found following two problem, would anybody help me?

(1) After the modelsim s/w lanuched and simulation completed, I check the simualtion result and edit the testbench for further testing. The modelsim s/w will response with error. However, when I close the modelsim s/w and retry the same procedure, the simulation run fine. Do I set something wrong in modelsim OR ISE?

(2) After the modelsim s/w lanuched and simulation completed, I want to extend the testing time in modelsim but I can't do it (for example, the current simulation is up to 1000ns and I want to extend it to 10000ns by typing "run 9000" on the modelsim command window).

BR
Keith

 

[nand_gates]

Re: Modelsim help

Hi,
Dont invoke modelsim thro' Xilinx ISE. Use ISE only for synthesis, P&R
and bit file generation.
Do the testing part separately. You write ur own testbench in VHDL dont use
wave form generator. This is the best practice.
Nothing is wrong with Modelsim or with the Xilix ISE its the way you are trying
to use the tools.

 

[ee_wmkab]

Re: Modelsim help

Dear nand_gates,

Do you mean write the testbench by VHDL and simulate it in Modelsim?
Why don't use the waveform generator? it seem that it is easy to use.

BR
Keith

 

[ieee]

Re: Modelsim help

Because of writing testbenches in VHDL is very good practice


Good Luck

 

[weilijun]

Re: Modelsim help

If you want to run the simulation for a longer time, you should do the following:
restart -f
run 5ms

 

[tongson]

Modelsim help

You can continue to run the simulation using the "continue" toolbar.
Try!!!

 

[pamulurureddy]

Modelsim help

for simulation use model sim and for place and route etc use Xilinx

-Reddy