Montecarlo: how to exclude some circuitry.

[Svenn Are Bjerkem]

Hi,

I my testbench I use the same flip-flop as driver and load for the DUT
in order to have a better model of my driver and my load. When trying to
characterize some of the mismatch behaviours of my DUT, I would like the
driver and the load _not_ to be statistically variated, the DUT only. I
haven't seen such an option documented anywhere and wonder if it is
possible at all in spectre. Kind of the same as an lvsignore flag set on
a simulation resistance, except it would be called something else.

--
Svenn

 

[S. Badel]

I've never heard of such an option, but you can change the transistor models
to point to some identical model with no statistical variations defined.

Stéphane

Svenn Are Bjerkem wrote:

Hi,

I my testbench I use the same flip-flop as driver and load for the DUT
in order to have a better model of my driver and my load. When trying to
characterize some of the mismatch behaviours of my DUT, I would like the
driver and the load _not_ to be statistically variated, the DUT only. I
haven't seen such an option documented anywhere and wonder if it is
possible at all in spectre. Kind of the same as an lvsignore flag set on
a simulation resistance, except it would be called something else.