16. The article non-transitory machine accessible storage medium of claim 13 , further comprising instructions which when executed causes the machine to perform: identifying a second semantic structure; assigning a signal activity to an output of the second semantic structure; and performing vectorless estimation on non-semantic structures.
16. The article non-transitory machine accessible storage medium of claim 13 , further comprising instructions which when executed causes the machine to perform: identifying a second semantic structure; assigning a signal activity to an output of the second semantic structure; and performing vectorless estimation on non-semantic structures. 17. The article non-transitory machine accessible storage medium of claim 16 , wherein assigning the signal activity to the output of the semantic structure comprises assigning a low toggle rate to a reset signal when the semantic structure is an asynchronous reset pin.