combinatorial loopback

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bhargav.scsvmv

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what is combinatorial loop back?
some one please explain it briefly
 

Imagine a combinatorial cloud, with n inputs and m outputs, the combinatorial logic inside the cloud can be any combination of logic gates. If some of the outputs are fedback to some of the n-inputs, we have a combinational loop. This causes problems in timing analysis.
 
Timing Analysis tool will not be able to figure out start point and end point through this loop
 

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