Wednesday, 29 February 2012

PLA


Programmable logic array consist of both AND array and OR array both are programmable.
The size of PLA is specified as n x k x m. Where n are inputs, k product terms, m outputs.
M different functions of n variables can be implemented, if each function has not more than k product terms.
If k=2n-1 all functions can be realized.
 In PLA only needed product terms can be generated and they can be generated and they can be shared between different functions that are going to be implemented on the same PLA.
 
Boolean function implementation using PLA:
Implement PAL problem in PLA.
Minimize the Boolean functions such there exists some minterms in common among the functions.
PLA table:
Implementation:

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