Diagnosis of Multiple Scan Chain Timing Faults

Online Scan Diagnosis - A Novel Approach to Volume Diagnosis

“…The normal practice of software-based chain diagnosis usually consists 2-step tests. A chain test that consists of shift-in and shift-out operations is first applied to detect any scan chain fail and to determine the defect type by simply analyzing the faulty shift-out sequence [22]. If a scan chain fails, scan/capture tests that are specifically generated by targeting the faults at scan cell pins are run to help allocate the defect location [23] [24].…”