Description of PLDs (Programmable Logic Device)

Programmable Logic Devices (PLDs) are chips with a few basic components that can be set up to perform different logic functions, like AND or OR. They let you connect these components in various ways, so you can create fairly complex logic circuits with fewer parts than if you were using separate logic devices. Plus, it's easier to change how the circuit works. Most PLDs have a special type of memory that keeps your settings even when the power is turned off.

What is PLC and PLD?

PLC and PLD are different types of logic devices:

PLC (Programmable Logic Controller): This is a fixed logic device that changes its function through software updates.

PLD (Programmable Logic Device): This is a flexible logic device where the function is determined by changing the internal circuit structure.

What is PLD in microprocessors?

A PLD, or Programmable Logic Device, is an electronic component used to create customizable digital circuits. Unlike fixed logic circuits that have set functions, the function of a PLD can be changed after it’s made.

What is an example of a PLD?

Examples of PLDs include logic gates, multiplexers, demultiplexers, and arithmetic circuits. Sequential logic devices like flip-flops, counters, and registers also fall into this category.

What are PLDs used for?

Programmable Logic Devices (PLDs), or Programmable Gate Arrays (PGAs), are used as a flexible foundation for designing complex digital circuits. Designers can customize these devices by programming the connections between cells to create specific logic structures.

What are the three types of PLC?

PLCs (Programmable Logic Controllers) come in three main types based on their outputs:

Relay Output PLC: Suitable for both AC and DC output devices.

Transistor Output PLC: Typically used for DC outputs.

Triac Output PLC: Designed for AC outputs.

What are the disadvantages of PLDs?

PLDs might not always offer the best performance. Specialized chips like ASICs (Application-Specific Integrated Circuits) or standard chips often perform better. This is because PLDs use existing logic blocks, which can limit their performance compared to custom-designed solutions.

What is the difference between PLD and IC?

An Integrated Circuit (IC) is a broad term for any chip that contains various electronic components. A Programmable Logic Device (PLD) is a type of IC that includes many gates and flip-flops that can be configured by the user to perform different functions. Unlike fixed-function ICs, PLDs can be reprogrammed to change their internal logic and connections.