Signetics PLS173 PLA fuse numbering?
glen.slick at gmail.com
Thu Sep 22 18:23:01 CDT 2016
A Signetics PLS173 PLA has a total of 2178 programmable fuses:
(32 AND gates for logic terms plus 10 AND gates for control terms)
(24 true/complement inputs plus 20 true/complement inputs/outputs)
= 1848 fuses
(10 OR gates)
(32 AND gates logic term outputs)
= 320 fuses
10 fuses for true/complement output selection
For reference see the PLS173 FPLA Logic Diagram on page 5-70 (page 242
of the PDF) of the Signetics PLD Data Manual 1987
The question is for anyone here that knows: How are these fuses in the
FPLA Logic Diagram numbered as they would be in a JEDEC fuse map file
used to program a device, or when read back from a device? I can't
find that information anywhere.
If I read a PLS173 device into a JEDEC fuse map it should be trivial
to generate the logic equations by hand if the fuse numbering is
known, which is what I want to do.
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