Design Rule Checking (DRC)

There are two DRC, logic DRC & physical DRC:

Logic DRC contain following three points:

1. Net fanout
2. Net capacitance
3. Net transition

Physical DRC contain various rule, and it's depends on technology, it is described in technology file (tf file), tf file example http://gudonghua.googlepages.com/tf-file-example.tf.txt.

Usually contain technology information such as:

1. MinWdith of all Layers
   
2. Fat Metal Width Spacing Rule
3. Fat Metal Extension Spacing Rule
4. Maximum Number Minimum Edge Rule
5. Adjacent Via Rule
6. Fat Metal Contact Rule
7. Fat Metal Extension Contact Rule
8. ......