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Date: Sat, 19 Nov 2011 08:15:35 +1100
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Subject: Re: [geda-user] Modern GAL/PAL design with gEDA?
From: Stephen Ecob <stephen DOT ecob AT sioi DOT com DOT au>
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On Fri, Nov 18, 2011 at 12:45 PM, Vanessa Ezekowitz
<vanessaezekowitz AT gmail DOT com> wrote:
>
> When it comes to making circuit boards out of chips and discrete components, I'm reasonably well educated, and gschem -> pcb is a no-brainer for me these days.  Similarly, I'm no stranger to programming, though I prefer to direct my efforts at vintage computing. Still, I think I've gotten pretty good at both concepts.  :-)
>
> However, my latest project requires something I've never even begun to touch before:  Programmable logic devices.
>
> So, here's what I want to do:
>
> I've drawn a small circuit in gschem consisting of four flip-flops and a handful of gates.  It isn't complete yet, but what I have seems to work exactly the way I want, and there's enough here to build a physical circuit to test the design's core function.  Each symbol has a refdes, none have been assigned footprints or slots (since neither seems like it would make sense in this case).
>
> Now I need to translate that schematic into something (a JEDEC file?) that I can burn into a 22V10 GAL.  I realize this is an older type of chip, but they are easy to purchase from Digikey and the like, and my current project only calls for enough logic to fill one of these - a CPLD or FPGA is just plain overkill.

For a more modern approach to tiny programmable logic take a look at
the Silego GreenPak.  GreenPak1 may be too small for your circuit, but
GreenPak2 may be a good fit:

http://www.silego.com/index.php?page=greenpak2

It's an interesting and versatile approach to tiny programmable logic.