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Original PAL programming algorithm

Chuck(G)

25k Member
Joined
Jan 11, 2007
Messages
38,870
Location
Pacific Northwest, USA
Good luck--the programming details were jealously guarded by the chip vendors and usually only disclosed to qualified parties operating under an NDA. At least that's what I found when trying to get the lowdown a couple-three decades ago.
 

Dwight Elvey

Veteran Member
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Jun 21, 2003
Messages
4,736
Location
Santa Cruz
It is likely the same as TI's that is online someplace. The most common thing that changed on the early ones was the current limit.
I'd like the GAL information myself. TI shows the fuse mapping as well.
Dwight
 

gslick

Veteran Member
Joined
Dec 30, 2010
Messages
2,112
Location
Seattle, WA
Does anyone have a documentation about original MMI PAL programming algorithm ?

MMI PAL Programmable Array Logic Handbook, Second Edition, 1981
www.bitsavers.org/components/mmi/_dataBooks/1981_MMI_PAL_Handbook_2ed.pdf

PAL Series 20 Programming, pages 7-6, 7-7 (pages 598, 599 of the PDF)
PAL Series 24 Programming, pages 7-14, 7-15 (pages 606, 607 of the PDF)

Each fuse to be programmed has a corresponding Input Line Number and Product Line Number. Tables are provided which specify the input pin values to select each Input Line Number and each Product Line Number. Tables are also provided which specify the input voltage levels and waveform timing parameters, along with programming waveform diagrams. There is a 9 step text description of the programming algorithm.
 

alecv

Experienced Member
Joined
Feb 21, 2010
Messages
230
Location
Switzerland, Geneva
gslick, Thank you! I saw this book but never went so far...

It looks sligtly similar to tungsten EPROM (2x2048x4).



P.S. I've found a rare Soviet PAL clone. White ceramic and gold...
PAL_R_s.jpg
 
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