Automatic clock tree synthesis exceptions generation

Abstract

Systems and techniques are described for automatically generating clock tree synthesis (CTS) exceptions. The process can use on one or more criteria to identify sequential circuit elements that can be ignored during clock skew minimization. For example, the process can identify sequential circuit elements whose clock skew cannot be balanced with other sequential circuit elements due to structural reasons, identify sequential timing elements that do not have a timing relationship with other sequential timing elements in the clock tree, and/or identify sequential circuit elements whose data pins have a sufficiently large slack so that clock skew is not expected to cause timing violations at any of the data pins. Next, the process can generate clock tree exceptions based on the identified sequential circuit elements.