Programmable Array Logic (PAL) Explained | Digital Electronics
In this video, the basic Architecture of Programmable Array Logic (PAL) has been covered. And through example, how to implement any logic circuit using the PAL is also explained.
The following topics are covered in the video:
0:00 What is PAL? Basic Architecture of PAL
5:52 Solved Example (Implementation of Logic Circuit using PAL)
13:42 Output macrocell in PAL
Programming Array Logic:
The PAL is one type of programmable logic device. In PAL, the AND gate array is programmable while the OR gate array is fixed. (The number of AND gates that can be connected with the OR gate is fixed).
In some PAL outputs, there is feedback from the output to the input side.
By reusing the output of the OR gate (by providing feedback to the input side), it is possible to reuse the product terms that is generated by the OR gate. And in this way, it is possible to implement a Boolean function with more product terms.
Apart from a programmable AND gate array and fixed OR gate array, the PAL also consists of output logic blocks/output macrocells. By configuring the output macrocell, it is possible to provide various output functionality in PAL.
In this video, the basic architecture of PAL, and the internal circuit of the output macrocell are explained in detail.
This video will be helpful to all the students of science and engineering in understanding the basic architecture of PAL and for learning how to implement a logic circuit using PAL.
The link for the other useful videos related to programmable logic devices:
1) Programmable ROM:
• How to use ROM as Programmable Logic ...
2) Programmable Logic Array:
• Programmable Logic Array (PLA) Explai...
3) RAM explained:
• Semiconductor Memories: RAM (Random ...
4) ROM explained:
• Semiconductor Memories: ROM Explained...
5) CPLD Explained:
• CPLD (Complex Programmable Logic Devi...
For more videos on Digital Electronics, check this playlist:
• Digital Electronics
The videos related to K-map:
1) 2-variable and 3-variable K-map:
• Karnaugh Map (K-map) : 2-Variable and...
2) 4-variable K-map:
• Karnaugh Map (K-map) : 4-Variable K- ...
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