Hierarchical Carry Look Ahead Adder (CLA)

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akeedthe

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ive successfully designed and tested a normal 9bit CLA.

Now im trying to design a 2 level hierarchical CLA to replace the previous 9bit CLA. basically 3x3bit CLAs at level 1 and 2bit CLA at level 2.

my problem is, how do I pass on the logic functions for group generate/propagate signals and also the subsequent carry-ins without making some sort of look ahead block which would already mean an extra (as designed initially) 9-bit CLA to get the functions needed.

Thank you
 

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