Re: [myhdl-list] intbv.saturate, intbv.wrap

[Christopher L. F. <cf...@uc...>]

I started (WIP) a wiki page for this, it is more convenient for  
outlining code and displaying plots than the newsgroup, http://myhdl.jandecaluwe.com/doku.php/projects:gcicexample?do=backlink 
.

Example is intended to illustrate parameterizable modules in MyHDL and  
designing the CIC for max gain (no integrator overflows).  Which  
requires more resources (bits and delay elements in the comb) but  
works good for higher order and no overflows.


On Jul 10, 2008, at 8:35 AM, Blubaugh, David A. wrote:

>
> Chris,
>
>
> Please tell us as to when you have finally generated Verilog or VHDL
> source code.  This sounds truly interesting to have NUMPY integrated
> with the MyHDL environment.
>
>
>
> David
>
>
>
>
>
>
>
> -----Original Message-----
> From: myh...@li...
> [mailto:myh...@li...] On Behalf Of
> Christopher L. Felton
> Sent: Thursday, July 10, 2008 8:36 AM
> To: General discussions on MyHDL
> Subject: Re: [myhdl-list] intbv.saturate, intbv.wrap
>
> Attached is an example of the CIC filter without using 2's compliment
> wrapping or modulus.  Adjusted the bitwidth for the maximum gain.  The
> plot attached is of the frequency response of the filter, green is
> averaged input spectrum and the blue is the averaged output spectrum.
> You can see that after scaling the response is expected for a D=5  
> (comb
> delay = 5) cic filter.  Only simulation thus far, haven't converted to
> Verilog or VHDL.
>
> Note, Because the comb filter is before the integrator (to help  
> control
> infinite gain of the integrator, hence no wrap) cannot take  
> advantage of
> inserting the decimation before the comb filter to reduced storage (#
> registers) for the comb.  this could be a draw backs (depending on how
> you look at it).
>
>
> Also, for this implementation I had to "hack" the MyHDL space.  This  
> is
> a complete hack (just temporary to do what I wanted to do).  Also
> attached are the diff's that I had to make to allow the numpy types in
> the generator (?).
>
>
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