Discussion
Which one of the following is not a PLD ?
Answer: D
The one that is not a PLD is the CLA.
CLA stands for carry look-ahead adder, a fixed arithmetic circuit that speeds up addition by computing the carries in parallel from generate and propagate signals. It cannot be programmed to perform another function.
The others are programmable logic devices. A PLA has programmable AND and OR arrays; a CPLD (complex PLD) combines several PAL-like blocks with a programmable interconnect; and a PROM, including a serial PROM, is the simplest PLD, a fixed AND array (the address decoder) followed by a programmable OR array.
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