关于新版PADS系统自带库的问题.

百度了一下找到了答案,谢谢"白山黑水",以下是从"白山黑水"新浪博客复制过来的,给有同样需要的人.
I'm looking for description about these libraries which category of component each library
covers or any other specifics, and what begining letter stands for.
In LP Viewer found PLB library files:
PCBM-STARTER.PLB09
BGA7351B.PLB09
SMN7351B.PLB09
SMM7351B.PLB09
SML7351B.PLB09
CNA7251.PLB09
CNB7251.PLB09
CNC7251.PLB09
CNP7251.PLB09
THA7251.PLB09
THB7251.PLB09
THC7251.PLB09
THP7251.PLB09
Answer
PCBM-STARTER = BGA & SMN combined with Mfr data added.
CN = Connectors
TH = Through-hole
SM = Surface Mount
A = Most Annular Ring for Through-hole
B = Nominal Annular Ring for Through-hole
C = Least Annular Ring for Through-hole
P = Proportional (The Annular Ring grows larger as the hole gets bigger for Through-hole)
SML = Least SMT Pad
SMN = Nominal SMT Pad
SMM = Most SMT Pad
BGA only comes in "Nominal" format
这里的Most ,Nominal , Least说的是封装在制作时的一个思维标准。Most 用于密度小的板子（pad 尺寸最大），Nominal用于密度适中的（pad尺寸中等），Least适用于密度大板子（pad尺寸最小）。