Electronics > Projects, Designs, and Technical Stuff

Looking for an algorithm to help deciper the contents of a PAL

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NivagSwerdna:

--- Quote from: FenTiger on February 02, 2020, 07:23:58 pm ---I've used Espresso for analysing truth tables like this before.

https://en.m.wikipedia.org/wiki/Espresso_heuristic_logic_minimizer

--- End quote ---
Thanks for that reference. I haven't come across this before; also Logic Friday.  :-+

rstofer:
Great tools!  Way better than rolling your own.
I may download LogicFriday just to see if it will produce a NAND  only (or NOR only) solution.

intabits:

--- Quote from: rstofer on February 03, 2020, 05:18:55 pm ---Great tools!  Way better than rolling your own.
I may download LogicFriday just to see if it will produce a NAND  only (or NOR only) solution.

--- End quote ---

Yes, it can:-


iMo:
Mind propagation delays  :D

up8051:
After some reverse engineering, based on the posted file:

/FDCWR =  PIN8 * /EF3X * /E * /RW
              + /PIN8 *                     RW


/FDCRD =  PIN8 * /EF3X * /E *  RW
            + /PIN8 *                     /RW


/BENQ =  A0 * MemEna * DGrnt * /E

/BENE = /A0 * MemEna * DGrnt * /E


/CAS0 = /A0 * /A15 * MemEna * DGrnt * Q4 * /E


/CAS1 =  A0 * /A15 * MemEna * DGrnt * Q4 * /E


/CAS2 = /A0 *  A15 * MemEna * DGrnt * Q4 * /E
      +                                                        Q4 *  E


/CAS3 =  A0 *  A15 * MemEna * DGrnt * Q4  * /E
      +                                                        Q4  *  E


This would still need to be tested.

Regards,
up8051 aka JarekC.DIY

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