Scanning chain fault diagnosis method and equipment based on side road scanning

The invention discloses a scanning chain fault diagnosis method and equipment based on side road scanning, and the method comprises the steps: scanning a digital circuit, and obtaining a plurality of scanning chain groups from the digital circuit; for any scanning chain group, generating a side transmission structure in the scanning chain group, and then carrying out feasibility analysis on the side transmission structure; when the sidewalk transfer structure is feasible, calling a first group of test vectors to carry out a scouring test on the scan chain group to obtain a first group of output vectors; when the first group of output vectors represents that the scan chain group has repairable faults, determining initial fault information of the scan chain group according to the first group of output vectors; according to the preliminary fault information, calling two groups of complementary test vectors to perform scanning test on the scanning chain group to obtain two groups of output vectors; and determinin