Common Path Pessimism Removal (CPPR):

• Common Path Pessimism (CPP)
• Applying different derating for the Launch and Capture Clock is overly pessimistic
• The Clock Tree will be at only one PVT condition, either as a maximum path or as a minimum path (or anything in between) but never both at the same time
• CPP is the delay difference along the common portion of the Clock Tree due to different deratings for Launch and Capture Clock Paths
• Pessimism caused by different derating factors applied on the common part of the Clock Tree is called Common Path Pessimism (CPP)/ Clock Re-convergence Pessimism (CRP) which should be removed during the analysis
• CRP or CPP = (maximum clock delay or skew) - (minimum clock delay or skew)
• Common Path Pessimism Removal (CPPR) or Clock Re-convergence Pessimism Removal (CRPR)
• Both CPPR and CRPR are removal of artificially introduced pessimism between the Launch Clock Path and the Capture Clock Path in timing analysis
• CPPR - terminology by Cadence
• CRPR - terminology by Synopsys