Programmable Logic Devices (PLD's)

The programmable logic devices (PLD's) are used in a lot of applications, and replace SSI and MSI circuits, due the space saving and reduce the number of devices in a certain design.
A PLD is made of a matrix of AND and OR gates, that can be programmed to obtain certain logic functions.
There are four types of devices that can be clasified as PLD's:

The Programmable Read-Only Memory, PROM.

The Programmable Logic Array , PLA.

The Programmable Array Logic, PAL.

The Generic Array Logic, GAL.

The next is an example of a PAL. Initially, it is programmed to detect parity. You can modify it to obtain some other logic function.

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Last modified 1/1/2000 by Juan de Lara ( Juan.Lara@ii.uam.es, http://www.ii.uam.es/~jlara) need help for using this courses?.

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