What is the problem of having combinational loop in a design?

[pd_engineer]

Hi,

What is the problem with having combinational loops in our design. why do we break it while doing synthesis.


Thanks

 

[santhosh007]

what is combinational loop

Hi,

What is the problem with having combinational loops in our design. why do we break it while doing synthesis.


Thanks

During the test mode, you cant determine the value of the combinational loop, it will be like a indefintie. So you need to break the combinational loop with simple or Gate with test mode signal to end the indefinite loop function.