Re: Implement IIR Filter on FPGA

On Apr 3, 6:57 pm, Ico <use...@xxxxxxx> wrote:
Gordon Freeman <gordonfreeman1...@xxxxxxxxx> wrote:
I'm designing filter system called IIR filter on the FPGA kit, but it
doesn't work when I implement on FPGA. When i iput the signals, the
output results seem to not get any thing. I do not know whether my
source code is wrong or another reason. The FPGA kit operate normally
with other sources which i loaded in the past.

Can anyone give me some advices to test what parts in my project do
not work or give me some idea to test anything. I am in the mess. I
hope everyone can show me.

The above mail gives me the feeling that you do not really understand
the technology you are using. Debugging such a situation should not be
too hard if you grasp how the different parts work. If something is 'not
working' from end to end, just take a look at what's happening in the
middle of the process; predict what kind of signal or behaviour you
would expect at that place, then measure and see if things match.

You did not give much information about your project, but I'd suggest
adding some code to output the signal at various stages of the process:
just after the A/D converter (if you are using one), just before the IIR
block, etc.

--
:wq
^X^Cy^K^X^C^C^C^C
Hi everyone!
Thank you for your reply!
I used ModelSim to simulate. The result is the same when I canculate
by calculator.
But when I implement on FPGA, it don't work too.
I design IIR filter with 10 orders. I use Matlab to generate
coefficients for filter (b(k) and a(k)). For coefficient "b", I
multiply with 2^14 and multiply with 2^5 for coefficent "a". After
that I round them. These coefficients stored in LUT. I use SDA for
filter. Because I think IIR filter include tow FIR filter. One filter
with coefficient "b" and one with coefficient "a". Is it right?

.

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