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Programmable logic array has
  • a)
    Fixed OR plane followed by a programmable AND gate
  • b)
    Fixed AND plane followed by a programmable OR gate
  • c)
    Programmable OR gate followed by a fixed AND gate
  • d)
    Programmable AND gate followed by a programmable OR gate
Correct answer is option 'D'. Can you explain this answer?
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Programmable logic array hasa)Fixed OR plane followed by a programmabl...
PLD’s (Programmable Logic Devices) are the circuits that contain an array of AND gates and another array of OR gates. There are three kinds of PLD’s depending upon the type of array, i.e.
  • Programmable Read-Only Memory
  • Programmable Array Logic
  • Programmable Logic Array (PLA)
  • ROM is a memory device that stores the binary information permanently.
Programmable Logic Arrays (PLA’s) implement two-level combination logic in sum-of-products (SOP) form.
PLA’s are Programmable AND array followed by Programmable OR array as shown:
PAL: Programmable AND array followed by fixed OR array
PROM:
  • It is known as programmable read-only memory
  • It includes both AND array & OR array
  • Out of these two arrays AND array is fixed and OR array is programmable.
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Programmable logic array hasa)Fixed OR plane followed by a programmable AND gateb)Fixed AND plane followed by a programmable OR gatec)Programmable OR gate followed by a fixed AND gated)Programmable AND gate followed by a programmable OR gateCorrect answer is option 'D'. Can you explain this answer?
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