工艺库相关

1、LVT, RVT, HVT 的区别
参考数字芯片后端实现-01: LVT, RVT, HVT 的区别

HVT = High V threshold. Can be used in the path where timing is not critical. So by using HVT cells we can save power. 用于非critical path，速度不快，但省功耗。
LVT - Low V threshold. One should use these cells in timing critical paths. These cells are fast but , comsumes more power due to its leakage. So it will consume more power. So use only when timing is critical. 用于critical path，速度快，但耗电高。
SVT- Standard V threshold. Best of both world. Medium delay and medium power requirment. So if timing is not met by small magin with HVT, you should try with SVT. And at last LVT. 速度和功耗居中。
RVT- Regular V threshold. Another name for SVT.
SLVT-Super low V threshold.

2、smic工艺库
sc7功耗相对sc9低，同时速度也相对sc9要低

下载后文件如下：

r1p0是lvt库（高速高功耗），r2p0是rvt库（一般速度和功耗）
FE,FB,FX,FT区别(官方介绍如下)：

对比各个文件夹可以发现
（a）FB比FE多了cdl，gds2文件，其它是一样的。

(b) FX是celtic，ccs等文件