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From: "Christopher R. Carlen"
Subject: Re: Need advice wiring up a CPLD
Date: Thu, 03 Oct 2002 12:00:27 -0700
Organization: Sandia National Laboratories, Albuquerque, NM USA
NNTP-Posting-Date: Thu, 3 Oct 2002 18:59:30 +0000 (UTC)
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Theron Hicks wrote:
> If you had asked this question about a year or two ago I would say you
> should seriously consider using a Spartan (5 volt compatibility) Given the
> low cost of decent FPGAs I personally would still use an FPGA. Use a
> reprogrammable serial prom to hold the code. Given the capacity of MEs to
> short or otherwise mis-connect outputs and inputs, I would condsider
> something in a socketable package for the FPGA (or, if you decide
> differently, the CPLD.) The reason I suggest the FPGA is that from personal
> experience, the project can quickly grow all out of proportion.
Thanks for your input.
Egad, an FPGA just isn't necessary. Remember, the existing
functionality utilizes about 5-10 2-input gates.
And the Coolrunner XPLA3 has 5V tolerant IO.
> Here is an idea that would perhaps really simplify the job for you... What
> about one of the demo boards from one of the distributors to do the job for
> you. Typically they have at least one clock input with an on-board
> oscillator(in case you need a digital one-shot or two) total cost would be
> about $200 at most. One source that I have seen that has impressed me is
> Insight Electronics. I have seen their boards and they are pretty good
Yes I am aware of that. Unfortunately, I tend to like to make my own
boards, because I am very fussy about having control over every little
aspect of the circuitry. In fact I just completed a CPLD dev. board
that took several months of after work hours at home to design. But it
is *so* flexible and just the way I like it that I have no regrets about
spending the time rather than buying one off the shelf.
Christopher R. Carlen
Principal Laser/Optical Technologist
Sandia National Laboratories CA USA
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