International Business Machines Corporation

Thomas Ruane

William J Lewis

Wei-Yi Xiao

Dean G Bair

Dean G Blair

A microprocessor simulation method, system, and program product, which are built upon the underlying hardware design of the microprocessor, stop normal functions of a simulation testcase, start the scan clocks, and record a first 'snap shot' of the scan ring data at an initial time. The hardware logic then rotates (shifts) the scan ring using the current scan data, and when the scan clock stops (where the stop of the scan clock is controlled based on the number of latches on the scan ring), another 'snap shot' of scan ring data is taken. The &#x201c;snap shots&#x201d; are compared and if both of the &#x201c;snap shots&#x201d; are identical the functional scan is successful. But if the functional scan verification fails to rotate the scan chain correctly, that is, if some of the latches do not match in the two &#x201c;snap shots,&#x201d; it becomes necessary to locate the broken spot within the large number of scan latches.

Multi-thread parallel segment scan simulation of chip element performance

A microprocessor simulation method, which is built upon the underlying hardware design of the microprocessor, stop normal functions of a simulation testcase, start the scan clocks, and record a first 'snap shot' of the scan ring data at an initial time. The hardware logic then rotates (shifts) the scan ring using the current scan data, and when the scan clock stops (where the stop of the scan clock is controlled based on the number of latches on the scan ring), another 'snap shot' of scan ring data is taken. The &#x201c;snap shots&#x201d; are compared and if both of the &#x201c;snap shots&#x201d; are identical the functional scan is successful. But if the functional scan verification fails to rotate the scan chain correctly, that is, if some of the latches do not match in the two &#x201c;snap shots,&#x201d; it becomes necessary to locate the broken spot within the large number of scan latches.

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Poughkeepsie, NY, United States of America

Thomas Ruane