how to measure the speed of a combinatorial circuit?

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Do you mean measure the critical path in a combinational design?
If yes, software that you use, reports it to you.
 

Combinational Circuits consists if digital gates. Each gate has its own propagation delay.
First find the critical path of the circuit.
then add the propagation delay of the all the elements present in the critical path .
(1/total propagation delay of critical path ) is the max speed at which your circuit can work.
 
Maybe you can try to synthesize this circuit.
You can set maximum delay or create virtual clock between each port.
The synthesis tool will tell you the maximum operating frequency.
 
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