[sdiy] Walsh update

[Tim Ressel]

Magnus et al,

Two reasons: One is my design uses 26 xor gates. that
would be 7 quad packages. That plus 3 dual flip flops
is a lot of wiring. Reason #2: I like CPLDs. If I
decide to invert the outputs, it takes 5 minutes with
a CPLD. In the real would it would take 7 more
packages wired in.

--TR


--- Magnus Danielson <cfmd at swipnet.se> wrote:
> From: Tim Ressel <madhun2001 at yahoo.com>
> Subject: [sdiy] Walsh update
> Date: Sat, 23 Mar 2002 15:44:01 -0800 (PST)
> 
> > To all,
> > 
> > AS you might have noticed, I kinda got distracted
> by
> > this little midi project. No, I haven't forgotten
> > about the Walsh thing. The board layout is done
> except
> > for checking. I am planning on sending the board
> out
> > for fab real soon now. The CPLD design has been
> done
> > for a while, its time for me to do the next part.
> > 
> > <------------------------------------------------>
> > In the spirit of the list, does anyone want to
> > volunteer to check the layout? I can mail a
> package
> > with all the docs. Don't have my PDF writer yet,
> so it
> > has to be snail-mail.
> > <------------------------------------------------>
> > 
> > This board will just be a breakout board for the
> Walsh
> > CPLD. I have provided for both molex-style
> connectors
> > (0.1") and dual-row header for ribbon cable. You
> can
> > also populate the connector pins with machine SIP
> > sockets to accept 24 ga solid wire.
> > 
> > This little kit will consist of board, CPLD, and
> > socket. Price will be in the $20-$25 range
> depending
> > on how much the boards cost me. I'm not trying to
> get
> > rich here, just trying to cover my costs.
> > 
> > I will let you know when the stuff is available.
> 
> Question:
> 
> Why do you need a CPLD?
> You can create any size of Walsh generator with a
> frequency divider
> and a handfull of XNOR gates. For a organ setup, all
> you need is the
> TOG part and 12 Walsh generators.
> 
> Maybe I should do a simulation and hand it out.
> 
> Cheers,
> Magnus


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