US Patent 7882410 Launch-on-shift support for on-chip-clocking

A method to perform launch-on-shift scanning for integrated circuits having multiple clock domains is presented. An integrated circuit includes both capture clock domains and non-capture clock domains. The portions of the test vectors for non-capture clock domains are shifted into the scan chains of the non-capture clock domains and allowed to settle prior to the last shift launch cycle and the capture cycle of the capture clock domains. Thus, the ambiguity of the timing between the non-capture domains and the capture domains caused by asynchronous clock signals is eliminated.