Boolean functions of these m input signals. Now imagine that the inputs are driven not by an m- bit address, but by m independent logic signals. When used as a memory, the ROM contains 2m words of n bits each. Consider a ROM with m inputs (the address lines) and n outputs (the data lines). Before the PLD can be used in a circuit it must be programmed, that is, reconfigured. Unlike a logic gate, which has a fixed function, a PLD has an undefined function at the time of manufacture. These AND gates, also known as product terms, are ORed together to form a sum- of- products logic array.Ī programmable logic device (PLD) is an electronic component used to build reconfigurabledigital circuits. The programmable elements (shown as a fuse) connect both the true and complemented inputs to the AND gates.
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