Programmable Logic Devices – Exercise – 1

6. Once a PAL has been programmed:

(a) it cannot be reprogrammed.
(b) its outputs are only active HIGHs
(c) its outputs are only active LOWs
(d) its logic capacity is lost

Answer
Answer : (a)
Explanation
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7. The difference between a PLA and a PAL is:

(a) the PLA has a programmable OR plane and a programmable AND plane, while the PAL only has a programmable AND plane
(b) the PAL has a programmable OR plane and a programmable AND plane, while the PLA only has a programmable AND plane
(c) the PAL has more possible product terms than the PLA
(d) PALs and PLAs are the same thing.

Answer
Answer : (a)
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8. The basic programmable logic array (PLA) contains a set of _____ gates, _____ gates, and ______ gates.

(a) NOT, NAND, OR
(b) NOT, AND, OR
(c) NAND, AND, NOR
(d) OR, NOR, AND

Answer
Answer : (b)
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9. The OR array in a PAL is ________.

(a) fixed
(b) programmable
(c) nonexistent; there is no OR array in a PAL
(d) floating

Answer
Answer : (a)
Explanation
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10. The difference between a PLA and a PAL is:

(a) The PLA has a programmable OR plane and a programmable AND plane, while the PAL only has a programmable AND plane.
(b) The PAL has a programmable OR plane and a programmable AND plane, while the PLA only has a programmable AND plane.
(c) The PAL has more possible product terms than the PLA.
(d) PALs and PLAs are the same thing.

Answer
Answer : (a)
Explanation
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