The designing of the programmable array logic can be done with fixed OR gates as well as programmable AND gates. The definition of term PAL or Programmable Array Logic is one type of PLD which is known as Programmable Logic Device circuit, and working of this PAL is the same as the PLA. Programmable Logic Array Design of Programmable Array Logic (PAL) These two are programmable, and efficiently uses the hardware. To overcome this issue, PAL and PLA were used. The initial programmable logic device was ROM, but it was not successful due to the hardware wastage issues as well as exponential growth enhancement in the every hardware application. Previous to programmable logic devices, the combinational logic circuits can be designed with multiplexers, and these circuits were rigid as well as compound, then PLDs are developed. A programmable logic device offers a simple as well as flexible logic circuit designing. The main difference among these two is that PAL can be designed with a collection of AND gates and fixed collection of OR gates whereas PLA can be designed with a programmable array of AND although a fixed collection of OR gate.

Both Programmable Array Logic and Programmable Logic Array are types of PLDs (programmable logic devices), and these are mainly used for designing combination logic mutually by sequential logic.

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