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From: Ken Smith
Subject: Re: does this fit in a 22V10 gal?
Date: Mon, 23 Sep 2002 15:11:33 +0000 (UTC)
Organization: a2i network
NNTP-Posting-Date: Mon, 23 Sep 2002 15:11:33 +0000 (UTC)
In article <firstname.lastname@example.org>,
Frank Bemelman wrote:
>Just want to know if this fits in a 22V10 before I even try.
>5 inputs -> a 5 bit adress
>1 output -> true if all inputs are zero.
>5 outputs -> the 5 bit adress + 1 (add one, no carry output required)
>I want to use this to adress 1 out of 32 modules that are chained
I have done almost exactly this with a 22V10. I had 6 bits of address to
deal with. In stead of adding one as you suggest here, I made a sequence
of values that were easier to put into PAL equations. If you think about
the psudorandom generation circuits that use and XOR and a shift register,
I think you'll understand the sort of sequence I used.
The advanage of this method is that you don't have to bring all of the
lines out of the PAL. Some of them just shift position. This makes the
circuit faster and leaves more of the PAL open for other uses.
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