Behavioural and Functional simulation

[optimuz]

Can anyone explain me what exactly the difference between behavioural and functional simulation. I want to know why functional simulation after Synthesis.

Thanks

 

[shanmugaveld]

"I want to know why functional simulation after Synthesis."....
During synthesis, optimization will happen, this may affect the functionality.

say you have used decoded state variables in your verilog code, "state" state_1 = 3'b001, state_2 = 3'b010 state_3 = 3'b100;
"enable <= state[2]" during synthesis if you forced FSM to do binary encoding. This may lead to functional mismatch.

In an always block, if you missed some signals in the sensitivity list. Both functional and netlist simulation will have mismatch.

 

[dftrtl]

You do functional Simulations on netlist to see timing is closed or not according to requirements.