A programmable logic device or PLD is an electronic component used to build reconfigurable digital circuits. Unlike a logic gate, which has a fixed function, a PLD has an undefined function at the time of manufacture. Before the PLD can be used in a circuit it must be programmed, that is, reconfigured.
Read more about Programmable Logic Device: Using A ROM As A PLD, Early Programmable Logic, PLA, PAL, GALs, CPLDs, FPGAs, Other Variants, How PLDs Retain Their Configuration, PLD Programming Languages, PLD Programming Devices
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