Self-Test AC Isolation
Original Publication Date: 1985-Jun-01
Included in the Prior Art Database: 2005-Feb-18
This method makes it possible to identify the initiating clock pulse of an AC failure, to identify the capturing clock pulse, to identify the capturing storage elements (latch or array bits), and to extract the hardware states just prior to and just after the failure for further diagnosis. An "AC failure" is defined as the erroneous setting of a storage element as the result of an AC fault. An "AC fault" is defined as a fault which manifests itself when the hardware is run at normal clock speed but not when the hardware is run at some slower clock speed. Generally, an AC fault is a delay fault. A "capturing storage element" is one that is erroneously set as a result of the failure. The "initiating clock pulse of an AC failure" is the clock pulse that generates the transition that starts the AC failure.