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GATE 1992 ECE Comparision of PROM, PLA and PAL Video Lecture
FAQs on GATE 1992 ECE Comparision of PROM, PLA and PAL Video Lecture
| 1. What is the difference between a PROM, PLA, and PAL? |  |
Ans. A PROM (Programmable Read-Only Memory) is a type of memory device that allows programming of specific data into it, which cannot be changed later. A PLA (Programmable Logic Array) is a digital circuit that can be programmed to implement combinational logic functions. A PAL (Programmable Array Logic) is a programmable logic device that consists of an array of AND gates followed by a fixed OR gate.
| 2. How does a PROM work? | |
Ans. A PROM works by storing data in a memory array consisting of multiple cells. Each cell can be either programmed or left unprogrammed. When a specific address is given, the corresponding programmed cell outputs the stored data. It uses a fuse or antifuse technology to permanently store the data.
| 3. What are the advantages of using a PLA over a PROM? | |
Ans. One advantage of using a PLA over a PROM is that it allows for reprogramming, as the logic functions can be changed by modifying the programming. This provides flexibility in designing and modifying circuits without having to replace the entire device. Additionally, PLA allows for more complex logic functions to be implemented compared to PROM.
| 4. Can a PAL be reprogrammed like a PLA? | |
Ans. No, a PAL cannot be reprogrammed like a PLA. Once a PAL is programmed, the logic functions are fixed and cannot be changed. To modify the logic functions, a new PAL needs to be programmed and replaced. This makes PALs less flexible and suitable for applications where the logic functions remain constant.
| 5. What are some common applications of PROM, PLA, and PAL? | |
Ans. PROMs are commonly used in applications where a fixed data or program needs to be stored, such as in microcontrollers, calculators, and remote controls. PLAs are used in various digital logic applications, including data processing, control systems, and arithmetic units. PALs find applications in areas where the logic functions remain constant, such as in memory decoders, address generators, and arithmetic logic units (ALUs).
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Jan 09, 2025
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