[Coco] Gal Logic

[jdaggett at gate.net]

Mark

Agreed that the GALs are cheaper than most CPLDs. GALS are now 
becoming a bit more difficult to find. Lattice seems to be the main 
manufacturer of them. As for CPLDs you have Lattice, Xilinx, Altera, 
Atmel, and Cypress all in that market. 

CPLDs are a bit more flexible and quite abit of the standard TTL logic can 
be implemented. Xilinxs smallest is the XC9536 which has 36 macro cells 
or the equivalent of 800 gates for around $3 to $4 single unit price.

Then again if you want to program multiple devices like GALs and memory 
then you can invest in multiple programmers like that you have. Gosh 
EPROMs, I almost forgot what those were since flash memory has gotten 
so cheap. 

james

On 30 Jan 2004 at 20:24, Mark Marlette wrote:

Date sent:      	Fri, 30 Jan 2004 20:24:22 -0600
To:             	CoCoList for Color Computer Enthusiasts 
<coco at maltedmedia.com>
From:           	Mark Marlette <mmarlett at isd.net>
Subject:        	Re: [Coco] Gal Logic
Send reply to:  	CoCoList for Color Computer Enthusiasts 
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> At 10:11 AM 1/30/2004 -0500, you wrote:
> 
> James,
> 
> I agree and disagree depending on the target. GALS are under $1 and if
> they will work then that is what I'll use. I use Altera's Max Software
> and that is free as well. I bought The DataMan 48LV programmer, that
> is what was $1300 plus some adapters. It does almost everything and
> that is what I needed. EPROMs, PAL, GALS, MPU, CPLD, serial EPROMs,
> etc.... Have used them all here at Cloud-9. New designs use JTAG
> programmers which I designed my own off of an Altera design. Improved
> and self powering with multi-voltage support. Altera's programmer for
> their free software is still $150. Haven't done Xilinx, Altera seems
> to do well in the CPLD arena for me and very cost effective.
> 
> I look at what the target is and I pick the product that fits the app
> the best. It would be easy from a training standpoint just to use one
> product line but I have yet to see one vendor have the solution for
> everything.
> 
> Mark
> Cloud-9
> 
> 
> >Mark
> >
> >My personal belief is to get away from a GAL and go to say one of the
> >smaller CPLDs. Beisdes doing any glue ligic that he is thinking of
> >there will always be a few other gates and stuff that can be thrown
> >into a CPLD that makes it a cost effective means.
> >
> >Besides the CPLDs are jtag programable and the software to design
> >them is free, well at Xilinx is.
> >
> >james
> >
> >
> >On 29 Jan 2004 at 23:35, Mark Marlette wrote:
> >
> >Date sent:              Thu, 29 Jan 2004 23:35:03 -0600
> >To:                     CoCoList for Color Computer Enthusiasts
> ><coco at maltedmedia.com>
> >From:                   Mark Marlette <mmarlett at isd.net>
> >Subject:                Re: [Coco] Gal Logic
> >Send reply to:          CoCoList for Color Computer Enthusiasts
> ><coco at maltedmedia.com>
> >         <mailto:coco-
> >request at maltedmedia.com?subject=unsubscribe>
> >         <mailto:coco-
> >request at maltedmedia.com?subject=subscribe>
> >
> > > At 11:55 AM 1/29/2004 -0600, you wrote:
> > >
> > > I do. Whgt development tools are you using? Abel? Most of what you
> > > are trying to do are operators. What is your target device? How
> > > are you going to program it once you have the equations written
> > > and compiled? Programmers run $100- $50k depending on what you
> > > want to do and how many. Mine is $1300.
> > >
> > > ??
> > >
> > > Regards,
> > >
> > > Mark
> > > Cloud-9
> > >
> > >
> > > >Does anyone know how to program a coco type clock generator
> > > >into a GAL chip? I understand combinational logic fairly
> > > >well, and am able to use "boolean" logic equations. My
> > > >understanding of "clocked" OR "Registered" logic is a bit
> > > >rusty.
> > > >What I want do do is build a dual J-K flip flop E and Q clock
> > > >generator in a GAL device not in TTL! Also is there a library
> > > >somewhere of equations for flipflops etc? Eric KB0LXY
> > > >
> > > >--
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