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Altera_Forum
Honored Contributor
Honored Contributormegacore fft sumulation help
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.8 Replies
Altera_ForumIs 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".
