METHOD AND SYSTEM FOR EVALUATING A CONSTRAINT OF A SEQUENTIAL CELL

摘要

The method evaluates a constraint of a sequential memory cell able to sample an input data item regulated by a clock signal. The constraint is dependent on the ramp of a first signal and on the ramp of a second signal. The method includes a characterization phase including a first step of determination in which a value of the second ramp is fixed, the value of the first ramp is made to vary so as to determine, a first set of values of the constraint. A second step of determination includes the value of the first ramp being fixed at one of its values taken during the first step of determination, the value of the second ramp is made to vary so as to determine for each value of the second ramp a deviation with respect to the value of the constraint belonging to the first set and corresponding to the fixed value of the first ramp. The method includes a third step of calculation in which the values of the constraint are calculated for all the values of the first ramp and of the second ramp, while adding the various deviations obtained to the values of the first set of values.