what are the types of PLDs and describe each?
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Answer:
1) Simple Programmable Logic Devices (SPLDs)
》Simple programmable logic devices (SPLD) are the simplest, smallest and least-expensive forms of programmable logic devices. SPLDs can be used in boards to replace standard logic components (AND, OR, and NOT gates), such as 7400-series TTL. They typically comprise 4 to 22 fully connected macrocells
2)Complex Programmable Logic Devices (CPLDs)
》A complex programmable logic device (CPLD) is a logic device with completely programmable AND/OR arrays and macrocells. Macrocells are the main building blocks of a CPLD, which contain complex logic operations and logic for implementing disjunctive normal form expressions.
3)Field Programmable Gate Arrays (FPGAs)
》A field-programmable gate array (FPGA) is an integrated circuit designed to be configured by a customer or a designer after manufacturing – hence the term "field-programmable".