VCLP

Synopsys VCLP = Verification Compiler - Low-Power

advanced low-power design techniquies:
1. power gating
2. Power Management Integrated Circuit (PMIC) power rail off
3. multi-VDD
4. body bias
5. and so on

Low-power rule check plays an important role in the overall low-power verification flow, and is a mandatory sign-off step for designs employing advanced low-power design techniques.

A sink side isolation cell is placed in a power domain (the sink domain) that receives an input from a different power domain (the source domain) which may be powered down while the sink domain is still powered up.
 => 一般常見，sink side isolation cell接收不同power domain (source domain)的訊號，而source domain可以off，但sink domain不能off。

A source side isolation cell is placed in a power domain (the source domain) and drives a valid signal into another power domain (the sink domain) when the source domain is powered down. A source side isolation cell is powered by VDDO and VSSO pins which must be powered on for the cell to work. They could be connected to always on power or to power from the sink domain.
=> source side isolation cell也不能斷電(always-on power or sink domain power)，若要斷電，則需要sink side isolation cell。