dr_kca
Junior Member level 3
Hi people,
I am currently interested on cell characterization methodologies and looking for ".lib" file creation. I have a little confusion on three state cells.
Let's consider a three-stete buffer cell, I see on several ".lib" files rise and fall transition time w.r.t enable pin. Rise/fall delay/transitions w.r.t to data pin when the enable is activated is very clear metrics with a given output load and input slope. What is the methodology for three state mode rise/fall delay/transition measurement ? Is there a generally accepted output load for testbenches ( like a pull-up for rise and pull down for fall measurements) in the three-state mode characterization. If only a capacitive load is used as the data pin, then there will be no discharging/charging on the output pin and will just keep it's previous value.
thank you !
I am currently interested on cell characterization methodologies and looking for ".lib" file creation. I have a little confusion on three state cells.
Let's consider a three-stete buffer cell, I see on several ".lib" files rise and fall transition time w.r.t enable pin. Rise/fall delay/transitions w.r.t to data pin when the enable is activated is very clear metrics with a given output load and input slope. What is the methodology for three state mode rise/fall delay/transition measurement ? Is there a generally accepted output load for testbenches ( like a pull-up for rise and pull down for fall measurements) in the three-state mode characterization. If only a capacitive load is used as the data pin, then there will be no discharging/charging on the output pin and will just keep it's previous value.
thank you !