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Altera_Forum's avatar
Altera_Forum
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16 years ago

multichannel FIR output timing error

When I use multichannel fir filter, the timing of output channels is not correct. The output generated by 1 channel shifted. For example, First channel data filtered out to second channel, second ...
Altera_Forum's avatar
Altera_Forum
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15 years ago

I think I've had a similar issue with a multichannel CIC filter. 8 inputs between SOP and EOP and these appear in a jumbled (but in a constant) position at the outputs relative to the output EOP/SOP.

My problem was the thing generating the input data.

There were some spurious DV's on the input, the first signal to enter the filter was an EOP rather than an SOP and the third packet had one DV too many between the SOP and EOP.

Bad design on my part:oops:. I fixed these and problem dissappeared. I suspect it was the extra DV between SOP/EOP.

Check your inputs carefully.