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Visitor
Visitor
21,483 Views
Registered: ‎06-23-2009

inverse FFT (can't make it work!)

I tried different timings for fwd_inv_we but none of them works (modelsim and ise simulator)

1. Before start 

2. Rising start and fwd_inv_we at the same cycle (page 25 , data sheet)

3.

 

fft core v5.0 - ise 9.2i sp4

pipelined, streaming i/o 

lenght 8

 target clock 200MHz

 unscaled

 truncation

 natural order

distributed ram

 ce

 

 

Matlab 

f   = [ 8 0 0 0 0 0 0 0];

iF = ifft (f);

iF = [1 1 1 1 1 1 1 1];

F  = fft (f);

F  = [8 8 8 8 8 8 8 8];

 

Thanks in advance.

 

waveform

inputoutput

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3 Replies
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Visitor
Visitor
21,389 Views
Registered: ‎06-23-2009

solved. 
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Visitor
Visitor
20,849 Views
Registered: ‎11-14-2009

hi 

i have run into the same qusetion as you .

coun you tell me how you fix it.

please send the project you have finished to my e-mail  601247983@qq.com

thank you.

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Xilinx Employee
Xilinx Employee
20,765 Views
Registered: ‎11-28-2007

Take a look at this message: http://forums.xilinx.com/xlnx/board/message?board.id=DSPTOOL&message.id=2159#M2159

 

Cheers,

Jim

 

Cheers,
Jim
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