Re: Signetics PLS173 PLA fuse numbering?

2016-09-22 Thread Eric Smith 
On Thu, Sep 22, 2016 at 6:56 PM, Glen Slick  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.

Re: Signetics PLS173 PLA fuse numbering?

2016-09-22 Thread Glen Slick 
On Thu, Sep 22, 2016 at 5:30 PM, Al Kossow  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.

Re: Signetics PLS173 PLA fuse numbering?

2016-09-22 Thread Al Kossow 
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.
>