From: "Frank Bemelman"
References: <7UjB9.9017$N02.email@example.com> <firstname.lastname@example.org> <email@example.com>
Subject: Re: I need an 8 to 256 decoder or equivalent
Date: Sat, 16 Nov 2002 22:27:03 +0100
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Organization: EuroNet Internet
NNTP-Posting-Date: 16 Nov 2002 21:27:15 GMT
"Keith R. Williams" schreef in bericht
> In article <firstname.lastname@example.org>,
> email@example.com says...
> > Which small EPLD/FPGA/thing-that-can-be-programmed
> > with 256 outputs do you recommend ?
> A "little" overkill but the Virtex-Pro 2VP4 (FF672 package)or perhaps
> two 2VP2s (FG256 package). There's all sorts of other toys in there
> for blinkin' lights too.
> Well they *are* smaller than 17 74XX154s and you didn't say you were on
> a budget. ;-)
Yes, that's true. My reply was meant to be a bit sarcastic. I would like
to know a bit more about the application. What are these 256 devices, is
it okay to multiplex them or not, are the devices indeed leds, what is
the distance between the devices, do we need cabling, connectors etc. Is
the input to the board really 8 parallel bits or is there a uC that we
can we program to do it serial, what is the minimum update frequency
required, etc, etc.
I could well be that 17 74XX154s are the best way to do this, even if
there is an unlimited 'budget'.
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