Can anybody explain the difference between chain patterns and Logical Patterns.
My doubt is that what ever the patterns, we generated from ATPG are all Chain patterns(because the patterns are generated through scan chains),then where the logical patterns comes into the picture?
Chain pattern is just to check the chain integrity. It checks that shifting-in and shifting-out is properly working or not.
Logic patterns is using the capture cycle, so combo logic in between 2 flops are also part of the patterns as we capturing from the functional D input.