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alperenpalp's avatar
alperenpalp
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5 years ago

Need Help with FIR II TDM.

Hello, I've been trying to get FIR filter working for quite a while, but I've been runnig into problems. I am basically trying to implement 51 tap low-pass filter. I am also trying to save hardwa...
alperenpalp's avatar
alperenpalp
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5 years ago

Thank you for your response,

I feed 15MSPS input to the IP, but I get 7.5MSPS output which is half of the input rate. Please look at the attached picture.

You can see that the clock is 60 MHZ and the source_valid is asserted at a rate of 7.5MHz(period is about 133 ns which is 7.5 MHz). What am I doing wrong? Clock rate is set to 60MHz and the input sampling rate is set to 15MSPS.

I am just trying to validate the impulse response of the filter and it's all over the place it seems like the IP skipping almost all of the coefficients.

Can you try to implement similar to see if you get a similar result

Thanks!

alperenpalp's avatar
alperenpalp
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5 years ago

Sorry I forgot to to attach the picture.

Here are the results as you can see the output 2 times lower than the input rate 7.5MSPS and the impulse response is all over the place.