Programmable Array Logic definition hardware
(PAL) A family of fuse-programmable logic integrated circuits
originally developed by MMI
. Registered or combinatorial
output functions are modelled in a sum of products
form. Each output is a sum (logical or) of a fixed number of products (logical and) of the input signals. This structure is well suited for automatic generation of programming patterns by logic compilers.
PAL devices are programmed by blowing the fuses permanently using overvoltage.
Today, more complex devices based on the same original architecture are available (CPLD's for Complex PLD's) that incorporate the equivalent of several original PAL chips. PAL chips are, however, still popular due to their high speed. Generic Array Logic
devices are reprogrammable and contain more logic gates