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Often asked: What is programmable logic array how it differs from ROM?

A read-only memory (ROM) is a logic circuit that can generate all of the possible minterms of its inputs. Output summation circuitry is programmable. A programmable array logic (PAL) has the input circuitry similar to that of the FPLA. However, the output circuitry includes hardwired OR logic and is not programmable.

What is programmable logic array how it is different from ROM?

Major Differences between ROM and PLA: In PLA both AND and OR arrays are configurable unlike in ROM, whereas only the OR gates array is configurable. 2. PLA has the capability to take ‘don’t care terms’ (Boolean overlaps) into account in which ROMs are incapable.

What is programming logic array?

A programmable logic array (PLA) is a kind of programmable logic device used to implement combinational logic circuits. The PLA has a set of programmable AND gate planes, which link to a set of programmable OR gate planes, which can then be conditionally complemented to produce an output.

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What is ROM & PLA?

ROM (Read Only Memory) and PLA (Programmable Logic Array) are used to implement logic functions. Both of them use the ‘Sum of Products’ logic configuration, which consists of a primary array of AND gates and a secondary array of OR gates.

What is PLA how does it differ from PAL?

Programmable Logic Array (PLA) and Programming Array Logic (PAL) are the categories of programming logic device. The distinction between PLA and PAL is that, PAL have programmable AND array and fixed or array. On the other hand, PLA have programmable AND array and programming OR array.

What are different programmable devices *?

These include Field Programmable Logic Devices (FPGAs), Complex Programmable Logic Devices (CPLD) and Programmable Logic Devices (PLD, PLA, PAL, GAL). There are also devices that are the analog equivalent of these called field programmable analog arrays.

What is a ROM and what does it do?

ROM is memory that cannot be changed by a program or user. ROM retains its memory even after the computer is turned off. For example, ROM stores the instructions for the computer to start up when it is turned on again.

Does a ROM have a programmable AND array?

Comparison with other Programmable Logic Devices: ROM has fixed AND gate array but programmable OR gate array.

What is difference between programmable array logic pal and programmable logic array PLA )?

The main difference among these two is that PAL can be designed with a collection of AND gates and fixed collection of OR gates whereas PLA can be designed with a programmable array of AND although a fixed collection of OR gate. A programmable logic device offers a simple as well as flexible logic circuit designing.

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Where is programmable array logic used?

Programmable Logic Arrays (PLAs) are widely used traditional digital electronic devices. The term “digital” is derived from the way digital systems process information; that is by representing information in digits and operating on them.

What are the advantages of ROM?

Advantages of ROM

  • Its static nature means it does not require refreshing.
  • It is easy to test.
  • ROM is more reliable than RAM since it is non-volatile in nature and cannot be altered or accidentally changed.
  • The contents of the ROM can always be known and verified.
  • Less expensive than RAM.

What is PLA material?

PLA is a type of polyester made from fermented plant starch from corn, cassava, maize, sugarcane or sugar beet pulp. The sugar in these renewable materials are fermented and turned into lactic acid, when is then made into polylactic acid, or PLA.


Read-Only Memory (ROM) is the primary memory unit of any computer system along with the Random Access Memory (RAM), but unlike RAM, in ROM, the binary information is stored permanently. And this is what makes ROM a Programmable Logic Device (PLD).

How does the architecture of PLA differ from ROM and PAL?

Main difference between PLA, PAL and ROM is their basic structure. In PLA, programmable AND gate is followed by programmable OR gate. In PAL, programmable AND gate is followed by fixed OR gate. In ROM, fixed AND gate array is followed by programmable OR gate array.

What is the difference between fixed and programmable logic?

Whereas a fixed logic device such as a logic gate or a multiplexer or a flip-flop performs a given logic function that is known at the time of device manufacture, a programmable logic device can be configured by the user to perform a large variety of logic functions.

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What are the different methods of programming of pals?

Other types of programmable logic devices:

  • Field-programmable gate array (FPGA)
  • Programmable logic array (PLA)
  • Programmable logic device (PLD) Complex programmable logic device (CPLD) Erasable programmable logic device (EPLD)
  • Field programmable logic array (Signetics FPLA)
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