megacore fft sumulation help

[Altera_Forum]

Hello to all. 

i want simulate the fft megacore with modelsim. I use the fft_tb.v generated from megacore.  the output alwas stay at fixed value (see picture).  i do not understand....   Now the simulation works in RTL mode only. In gate level not working.  The outputs are always at HIz.  I attach the modelsim projects. just edit the runme.tcl with correct quartus path.

[Altera_Forum]

Is it SIMU_GATE or SIMU_RTL you are simulating? 

 SIMU_GATE produces output with Quartus 14.0 + Modelsim 10.1e

[Altera_Forum]

TNX James. 

I attach my simulation of SIMU_GATE with modelsim 64bit 10.2c.  have you only launched the runme.tcl in the modelsim software, or have you used qartusII 14 for compilation?

[Altera_Forum]

I ran your script in modelsim. I shall attach a picture of the output in a mo. Ahh sorry it was the RTL I simulated, which worked fine. So it is the gate level that fails? Sorry misread your initial post.

[Altera_Forum]

I get the same result as the last pic you posted (running script only). Only bottom bit of the output active all others tri-state :-(. Very odd!

[Altera_Forum]

--- Quote Start ---  I get the same result as the last pic you posted (running script only). Only bottom bit of the output active all others tri-state :-(. Very odd!  --- Quote End ---    Yes.. rtl simulation have outputs ok..  gate simulation have output high impedance :(

[Altera_Forum]

OK now i resolved the problem. 

I assigned incorrectly the size bus in my top level module. Now gate simulation works fine. TNX!!!!!!!!!!!!!!!

[Altera_Forum]

Hi  

I am new to megacore. I need to have FFT worked for my OFDM. I generated FFT code with the megacore. How can I stimulate the output with the Modelsim. I attached th tb_fft.vhd fft.vhd and fft.vho files to the project but it didnt work. Please help

[Altera_Forum]

In my first post i attach in a zip file (fft.zip) 

You can view those files, in particular file "runme.tcl".