22 Sep
2016
22 Sep
'16
4:23 p.m.
A Signetics PLS173 PLA has a total of 2178 programmable fuses:
(32 AND gates for logic terms plus 10 AND gates for control terms)
times
(24 true/complement inputs plus 20 true/complement inputs/outputs)
= 1848 fuses
(10 OR gates)
times
(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
http://www.bitsavers.org/_dataBooks/1987_Signetics_pldData.pdf
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.
22 Sep
22 Sep
5:30 p.m.
there is a better diagram on page 70 of
981-0251_ProgrammableLogicDiagramPackage_Sep90.pdf
under dataIO which gives the fuse number
On 9/22/16 4:23 PM, Glen Slick wrote:
A Signetics PLS173 PLA has a total of 2178
programmable fuses:
(32 AND gates for logic terms plus 10 AND gates for control terms)
times
(24 true/complement inputs plus 20 true/complement inputs/outputs)
= 1848 fuses
(10 OR gates)
times
(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
http://www.bitsavers.org/_dataBooks/1987_Signetics_pldData.pdf
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.
5:56 p.m.
On Thu, Sep 22, 2016 at 5:30 PM, Al Kossow <aek at bitsavers.org> wrote:
there is a better diagram on page 70 of
981-0251_ProgrammableLogicDiagramPackage_Sep90.pdf
under dataIO which gives the fuse number
Excellent. That is exactly what I was trying to find. Thank you.
Would have been nice if Signetics had put that information into their
databooks / datasheets.
6:02 p.m.
On Thu, Sep 22, 2016 at 6:56 PM, Glen Slick <glen.slick at gmail.com> wrote:
Would have been nice if Signetics had put that
information into their
databooks / datasheets.
The original 82S173 predated the JEDEC JESD3 standard for PLD fuse
data, so numbers weren't assigned. They probably just kept copying the
same diagram in later versions of the datasheet, without considering
that the JEDEC numbering should be added.
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