Programmable Array Logic Questions and Answers

Digital Circuits Questions and Answers – Programmable Array Logic

This set of Digital Electronics/Circuits Multiple Choice Questions & Answers (MCQs) focuses on “Programmable Array Logic”.

1. A PLA is similar to a ROM in concept except that ____________
a) It hasn’t capability to read only
b) It hasn’t capability to read or write operation
c) It doesn’t provide full decoding to the variables
d) It hasn’t capability to write only

Explanation: In concept, a PLA is similar to a ROM, except that it does not give full decoding of the variables and does not generate all of the minterms. Programmable Logic Arrays are fixed-architecture logic devices that have programmable AND gates and programmable OR gates. It’s a PLD of some sort.
2. For programmable logic functions, which type of PLD should be used?
a) PLA
b) PAL
c) CPLD
d) SLD

Explanation: Because PAL is made up of programmable AND gates and fixed OR gates, the amount of circuitry required is reduced.
3. The complex programmable logic device contains several PLD blocks and __________
a) A language compiler
b) AND/OR arrays
c) Global interconnection matrix
d) Field-programmable switches

Explanation: The complex programmable logic device includes various PLD blocks as well as a global connectivity matrix that allows it to communicate with several devices. Field-Programmable Gate Arrays is another name for it (FPGAs).
4. Which type of device FPGA are?
a) SLD
b) SROM
c) EPROM
d) PLD

Explanation: FPGAs (Field-Programmable Gate Arrays) are silicon devices that can be reprogrammed. Programming an FPGA, unlike traditional processors, rewires the device itself to implement your functionality rather than running a software application. FPGAs are hence PLD devices.
5. The difference between a PAL & a PLA is ____________
a) PALs and PLAs are the same thing
b) The PLA has a programmable OR plane and a programmable AND plane, while the PAL only has a programmable AND plane
c) The PAL has a programmable OR plane and a programmable AND plane, while the PLA only has a programmable AND plane
d) The PAL has more possible product terms than the PLA

Explanation: The fundamental distinction between a PAL and a PLA is that the PLA has a programmable OR plane as well as a programmable AND plane, whereas the PAL only has a programmable AND plane and a fixed OR plane.
6. If a PAL has been programmed once ____________
a) Its logic capacity is lost
b) Its outputs are only active HIGH
c) Its outputs are only active LOW
d) It cannot be reprogrammed

Explanation: Only a programmable AND plane and a fixed OR plane are available in PAL. Because PAL is a living organism. As a result, it cannot be reprogrammed.
7. The FPGA refers to ____________
a) First programmable Gate Array
b) Field Programmable Gate Array
c) First Program Gate Array
d) Field Program Gate Array

Explanation: Field Programmable Gate Array (FPGA) stands for Field Programmable Gate Array. FPGAs (Field-Programmable Gate Arrays) are silicon devices that can be reprogrammed. Programming an FPGA, unlike traditional processors, rewires the device itself to implement your functionality rather than running a software application. FPGAs are hence PLD devices.
8. The full form of VLSI is ____________
a) Very Long Single Integration
b) Very Least Scale Integration
c) Very Large Scale Integration
d) Very Long Scale Integration

Explanation: The full form of VLSI is Very Large Scale Integration in which FPGA is implemented.
9. In FPGA, vertical and horizontal directions are separated by ____________
a) A line
b) A channel
c) A strobe
d) A flip-flop

Explanation: Field Programmable Gate Array (FPGA) stands for Field Programmable Gate Array. FPGAs (Field-Programmable Gate Arrays) are silicon devices that can be reprogrammed. A channel in an FPGA separates the vertical and horizontal directions and defines the output location.
10. Applications of PLAs are _____________
a) Registered PALs
b) Configurable PALs
c) PAL programming
d) All of the Mentioned

Explanation: PLAs are used for Registered PALs, Configurable PALs, and PAL programming, all of which need the use of an extra flip-flop with PAL.

11. The inputs in the PLD is given through ____________
a) NAND gates
b) OR gates
c) NOR gates
d) AND gates

Explanation: The PLD’s inputs are routed through an AND gate, which is followed by an inverting and non-inverting buffer. PLDs (Programmable Logic Devices) are single-chip devices that combine logic gates, flip-flops, and registers. As a result, it can be divided into three categories: PROM, PAL, and PLA.
12. PAL refers to ____________
a) Programmable Array Loaded
b) Programmable Logic Array
c) Programmable Array Logic
d) Programmable AND Logic

Explanation: Programmable Array Logic (PAL) is a type of logic that consists of programmable AND gates and fixed OR gates.
13. Outputs of the AND gate in PLD is known as ____________
a) Input lines
b) Output lines
c) Strobe lines
d) Control lines

Explanation: Outputs of the AND gate in PLD is known as output lines.
14. PLA contains ____________
a) AND and OR arrays
b) NAND and OR arrays
c) NOT and AND arrays
d) NOR and OR arrays

Explanation: Programmable Logic Arrays are fixed-architecture logic devices that have programmable AND gates and programmable OR gates. It’s a PLD of some sort.
15. PLA is used to implement ____________
a) A complex sequential circuit
b) A simple sequential circuit
c) A complex combinational circuit
d) A simple combinational circuit

Explanation: Because PLA is made up of programmable AND and OR gates. As a result, it’s employed to create complex combinational circuits.

The categories of programming logic devices include Control System Array (PLA) and Programming Array Logic (PAL). PLA and PAL differ in that PAL has programmable AND array and PLA has fixed or array. PLA, on the other hand, offers both a programmable AND and a programmable OR array. In concept, a PLA is similar to a ROM, except that it does not give full decoding of the variables and does not generate all of the minterms. Programmable Logic Arrays are fixed-architecture logic devices that have programmable AND gates and programmable OR gates. It’s a PLD of some sort.

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