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A PLA is similar to a ROM in concept except that ____________

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A PLA is similar to a ROM in concept except that ____________

(a) It hasn’t capability to read only

(b) It hasn’t capability to read or write operation

(c) It doesn’t provide full decoding to the variables

(d) It hasn’t capability to write only

The question was asked during an online exam.

Question is from Programmable Array Logic topic in chapter Memory Devices of Digital Circuits

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The correct choice is (c) It doesn’t provide full decoding to the variables

Easy explanation: A PLA is similar to a ROM in concept except that it doesn’t provide full decoding to the variables and doesn’t generate all the minterms as in the ROM. Programmable Logic Array is a type of fixed architecture logic devices with programmable AND gates followed by programmable OR gates. It is a kind of PLD.

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