Tetramax add_atpg_constraints and X-free response

[aajizattari]

Tetramax add_pi_constraints and X-free response

I have a small combinational circuit.

I use add_pi_constraint command to set certain primary inputs of a circuit to X (unknown).

e.g. add_pi_constraint X input1

Because of this constraint, certain outputs will become X.

However, I want to mask the effect of this X and force Tetramax to generate X-free response.

Is that possible?

 

[maulin sheth]

Re: Tetramax add_pi_constraints and X-free response

Hello,

If we are setting add_pi_constraint to x then It will be surely propagated to the inside of design. First, I would like to know that why you set constraint as X? Generally we are using add_pi_constraints command for defining constant value on top level ports.