In OpenSTA, what is the difference between internal power and switching power?

Static power (leakage) and Dynamic power (switching charge/discharge losses) ?

Leakage is different from internal

I see yes, and its the largest contributor, is the switching power the worst case scenario based on every driven pin transitioning at CLOCK_PERIOD rate. If you modify the period how do all values change?

image.png

Increasing period time in nanoseconds means slower clock rate so less switching so less switching losses, so looks like the outcome you are getting is expected.

Yes

At little but more research on this. the Liberty

.lib

file information has separate fields for such things as

library.cell.leakage_power

and

library.cell.pin.internal_power.{fall,rise}_power

so I would guess this is STA keeping these fields separate (because .lib expresses characterstics separately) when performing analysis and reporting.

If I remember correctly, internal power is also the short circuit power. When switching happens there is momentarily a period when you have pull up and pull down both switched on. It causes a short from vdd to gnd. Internal power is that power