Solved Example: 9161-01

Select the correct statement: (ESE Electronics 2010 Paper II)

A. PROM contains a programmable AND array and a fixed OR array

B. PLA contains a fixed AND array and a programmable OR array

C. PROM contains a fixed AND array and a programmable OR array

D. PLA contains a programmable AND array and a fixed OR array

Correct Answer: C

Solved Example: 9161-02

Consider the following statements regarding PROM/EPROM:

1. The erasable programmable ROM using ultraviolet erasing is known as EPROM.

2. The ROM that makes use of the electrical voltage for erasing is known as electrically alterable ROM.

3. A PROM can be programmed many times after fabrication.

Which of the above statements are correct?

A. 1 and 2 only

B. 1 and 3 only

C. 1, 2 and 3

D. 2 and 3 only

Correct Answer: A

Solved Example: 9161-03

_______ have fixed AND gates and programmable OR gates. (DFCCIL Executive S and T Sep 2021)

A. PALs

B. MBM

C. PROMs

D. FPLAs

Correct Answer: C

Solved Example: 9160-01

PALs tend to execute ________ logic.

A. SAP

B. SOP

C. PLA

D. SPD

Correct Answer: B

Solved Example: 9160-02

The difference between a PLA and a PAL is:

A. The PLA has a programmable OR plane and a programmable AND plane, while the PAL only has a programmable AND plane.

B. The PAL has a programmable OR plane and a programmable AND plane, while the PLA only has a programmable AND plane.

C. The PAL has more possible product terms than the PLA.

D. PALs and PLAs are the same thing.

Correct Answer: A

Learning Objectives:

1. Define programmable logic array (PLA).
2. Describe the general structure of a PLA.
3. Implement canonical equations using a PLA.

Solved Example: 9160-03

Which of the following statement is true for Programmable Logic array (PLA) ? (ISRO Scientist EC May 2017)

A. Fixed AND array and Fused programmable OR array

B. Fused programmable AND array and Fixed OR array

C. Fused programmable AND array and Fused Programmable OR array

D. None of the above

Correct Answer: C

Solved Example: 9160-04

The difference between PLA and ROM is: (ESE Electronics 2011 Paper I)

A. PLA is sequential, ROM is combinational

B. PLA is combinational, ROM is sequential

C. PLA economizes on the number of min-terms to implement Boolean functions

D. PLA has fixed AND array, ROM has fixed OR array

Correct Answer: C

Solved Example: 9160-05

PLA consists of: (DFCCIL Executive S AND T 2018)

A. Programmable AND and fixed OR arrays

B. Programmable AND and programmable OR arrays

C. Fixed AND and Programmable OR arrays

D. Fixed AND and Fixed OR arrays

Correct Answer: B