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Author: Admin | 2025-04-27
Several different types of Programmable Logic Devices, each of which has various programmable features. They are as follows:Programmable Read Only Memory (PROM)In a typical Programmable Read Only Memory, or PROM, the input is fed into a fixed AND array which acts as the decoder, and then is processed through a programmable OR array before giving the output.Programmable Array Logic (PAL)A Programmable Array Logic, or PAL device comprises of a programmable AND array and then fixed OR array in that sequence. As such, the output of these devices would be the combination of the inputs in the form of sum of products. These devices usually have an array of transistor cells.Programmable Logic Array (PLA)A PLA, or Programmable Logic Array, comprises of two programmable AND and OR arrays one after the other, sandwiched between the input and the outputs.Complex Programmable Logic Device (CPLD)In a CPLD, or a Complex Programmable Logic Device, there is a set of blocks, each comprising of Programmable logic devices which are then connected by a global interconnection matrix. As a user, you have the ability to program the individual Programmable logic device blocks, as well as the interconnects that adjoin the various PLD blocks with each other. Read more about CPLDs here.Field Programmable Gate Array (FPGA)FPGAs typically consist of a programmable logic matrix, a programmable routing matrix, and programmable inputs/outputs. The programmable logic structure is basically a two dimensional array of logic blocks which can be configured by the user. The programmable routes are the routing channels and connection or switch boxes that connect the various blocks and pins together in the circuit. Ultimately, you can also configure the I/O buffer pins and determine which pins on the chip function as the input pins, output pins, or the I/O pins. Read more about FPGAs here.Why Should You Used
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