Have you seen setup fails in ATPG TEST mode?

o   Scan shift runs at lower frequency but scan capture runs at function or near functional frequency. In capture mode we can see setup violations.

o   ATPG patterns activate paths that might not be the most critical during normal functional operation but become critical under specific test stimuli. These paths might not have received sufficient optimization focus during PnR if only functional mode was prioritized.

o   False Paths in Functional Mode: Paths that were correctly defined as false paths during functional mode might become active during certain ATPG patterns (especially if set_case_analysis for test mode enables them).