4 Nov
2005
4 Nov
'05
10:27 p.m.
Chuck Guzis wrote:
On 11/5/2005 at 1:09 AM ard at p850ug1.demon.co.uk
wrote:
Yes I think you can still do that with the orginal PAL's that they
don't make. If I remember
right the early pals were programmed as 512x8 fuse roms. The fuse map
was a one-to-one mapping
as you have with the logic diagram. The Cypress semiconductor data
book has programing information
on their PAL's but the data book is from the 90's.
Waht somebody needs to do (and it can't be me
for obvious reasons) is to
select some CPLDs/FPGAs where the download protocol is documented (that
is, you can progam the chip, given the binary file, without a proprietary
programmer), and use the tools (that's why it can't be me) to make some
useful logic functions -- things like an <n> bit universal shift
register, <n> bit ALU, counters, even JK flip-flops, gates, etc. Make the
binary files available for free download.
Hey, nobody did it with PALs, why would they do it with something more
complex?