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From: email@example.com (Hal Murray)
Subject: Re: Need advice wiring up a CPLD
Date: Thu, 03 Oct 2002 05:25:09 -0000
X-newsreader: xrn 9.02
Sender: murray@glypnod (Hal Murray)
[snip description of magic-box gizmo]
Sounds like a fun project.
I'd suggest that you look at your current collection of circuits
your users are using and try implementing them with various proposed
How are you going to program the CPLD? Perhaps another small connector
on your daughter card so you can plug in a PC/laptop.
Are you expecting to do a lot of programming on the fly, or mostly use
a handful or normal/popular boxes? How are you going to test things?
Are you going to program them all or will you setup a system so your
users can program their own boxes?
Are you going to leave enough room on the front to attach a drawing of
the circuit diagram? Maybe the drawing should slip over the BNC
connectors so it's really obvious which gate is connected to which
Are the in/out LEDs really necessary of you have a good drawing?
How many are you going to make? Would it be simpler/cheaper to
dump the LEDs, switches, and unused IO gear and always put the output
connectors on the top (or someplace distinctive)?
If you have more IO pins than connectors, can you parallel several
of them and get rid of your 74ACTQ14 output buffer chips? (Might be
ugly to program.)
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