What's the function of file *.cbe?

I find that in many sets of PDK:
One device will correspond to one *.cbe file.
For example: one pmos symbol will correspond to pmos.cbe
I guess the file *.cbe is just like the skill file *.ile, which
will be load to ciw automatically.
But, anybody can help that:
1. How to generate the file *.cbe? By hand?
2. What's the detailed flow of generate PDK including *.cbe
file?

 

The suffix ".cbe" is nothing special - I suspect in the PDK they are storing the
SKILL code for CDF Callbacks into a file, and those files have been encrypted,
hence the name ".cbe".

Most likely, the code was written by hand, and then encrypted with encrypt().

Having such files is PDK-specific. It's not required - some PDKs would put all
their CDF callbacks in a context file, some in plain SKILL, and some would avoid
CDF callbacks altogether (hurrah!).

Regards,

Andrew.