>> synthesis script 아래 내용포함 하면

set_attribute [get_libs <hvt library name>] default_threshold_voltage_group HVT -type string
set_attribute [get_libs <rvt library name>] default_threshold_voltage_group RVT -type string
set_attribute [get_libs <lvt library name>] default_threshold_voltage_group LVT -type string


>> 아래와 같이 compile log에 display 된다.

Threshold voltage group cell usage:
>> HVT 91.67%, LVT 0.00%, RVT 8.33%