On 2/14/2014 3:41 PM, David C Brown wrote:
> I have just built a small circuit using seven 74F TTL chips which works
> fairly well at 50MHz.  I would now like to cram it into a single chi and
> speed it up a tad. .  Casting my mind back many years when I was working =
we
> used devices called GALs from Lattice and I suspect that SPLDs are the
> modern equivalent.
>
> Questions.  Would these devices work at 80MHz?   Who is the favourite
> manufacturer?  How do you program them?
>
> And, yes, I have Googled but that has only increased my confusion

David,
Lattice was recently bought by Microsemi. They have a variety of CPLDs=20
which are likely what you'll want to use. They are nonvolatile=20
programmable logic devices. If you used 7 logic chips then you can=20
probably use the smallest device that has the requisite number of i/o pins.

There are other manufacturers to look at: Altera and Xilinx.

Personally I really like the Quartus software that Altera supplies. I=20
hear the Lattice/Microsemi software is easy to use as well.

-
Martin K
--=20
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