lib2db---Warning. Please take a look at it.

[googler123]

I am using the Design Compile to convert XXX.lib 2 XXX.db.


But there are many warnings ,,here is it..

Warning: Line 211468, Cell 'XOR3X4', pin 'Y', The 'values' attribute has a '-0.089602' value,
which is less than '0.000000' the minimum recommended value of this attribute. (LBDB-272)
Warning: Line 211468, Cell 'XOR3X4', pin 'Y', The 'values' attribute has a '-0.032635' value,
which is less than '0.000000' the minimum recommended value of this attribute. (LBDB-272)
Warning: Line 211574, Cell 'XOR3X4', pin 'Y', The 'values' attribute has a '-0.045365' value,
which is less than '0.000000' the minimum recommended value of this attribute. (LBDB-272)
Warning: Line 211656, Cell 'XOR3X4', pin 'Y', The 'values' attribute has a '-0.003312' value,


And as we known,the XX.lib file must has not that values.

So,Why it has negative values?? and The tools changed some values in which I want to know How the tools calculate out them?

Could you give some information?

Thanks a lot.

 

[yx.yang]

As the evolution of process, there does exit negative values in *.lib. Such as A->Y delay value, DFFs' D pin hold value. So, you may open some options when you use the command to convert *.lib the *.db. And you may need use an newer version of DC, such as after 2005.