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FFT source_ready in simulation

Altera_Forum
Honored Contributor II
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Hello, 

 

 

I have a question to the FFT reaction on source_ready. 

After source_eop I set source_ready to '0' for 3 clock cycles and then set it to '1' again. 

(picture http://www.directupload.net/file/d/3896/qklbqmig_png.htm

 

 

1 clock after source ready gone to '0' the source valid of the fft shows something like a "glitch"(?) and sets  

source valid to '0' two clocks after that. With the next clock edge, source_valid is high again. 

 

 

The number of clock cycles where source_ready is low seems to have no influence on this behavior. It also happens with 50 cycles 

source_ready low. 

 

 

For simulating I have used the auto-generated testbench from the MegaWizard Plugin Managerand compiled the .vho to the work library of 

Modelsim.  

 

 

Is this behavior normal or is my simulation somehow wrong? What can I do to solve the problem? 

 

 

thanks in advance and best regards, 

Andreas
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