求助lib中的internal power的具体定义

aureage

楼主，这个问题好像是两种都有的，就是有的lib里面的internal只包含短路电流功耗，有的lib里面包含了短路电流功耗和cell的翻转功耗。ptpx中有这样一个命令 power_table_include_switching_power 默认情况是true就是说包含了cell内部的翻转功耗。详细可见ptpx ug 区别的方法文中如是说：
“The best way of finding out the formula used in the characterization is to consult the library
vendor. A workaround is to inspect the falling power tables. If most of them have negative
numbers, it is likely that formulas 1 and 2 are used in characterization.”

但是我有个问题，还请楼主赐教：
internal power 在lib中记录的是energy （焦耳） 还是power (瓦特) ？ 感觉synopsys文档中有混淆， 如果是请告诉单位，谢谢

aureage

回复 2# icfbicfb

版主，能解答一下我的问题吗？

aureage

“Internal power in the Liberty (.lib) format refers to the amount of energy
consumed by a cell during a switching event,” 来自SILICONSMART的UG,

The unit for switching power and internal power is a derived unit. It is derived from the
following function:
(capacitive_load_unit voltage_unit^2) ⁄ time_unit
来自Library Compiler Modeling Timing, Signal Integrity, and Power in Technology Libraries User Guide
换算到标准量纲是mJ