Performing temporal checking

US7853420B2 · kind B2 · utility

Assignee

• International Business Machines Corporation · US

Inventors

• Parag Birmiwal · Austin, US
• Sundeep Chadha · Austin, US
• Tilman Gloekler · Schrobenhausen, DE
• Johannes Koesters · Holzgerlingen, DE

Key dates

• Filing date: Apr 14, 2008
• Grant date: Dec 14, 2010
• Expiry date: Jun 9, 2029

Classification

• Technology area (CPC G): Physics
• CPC primary: G01R31/318328
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

An apparatus for performing temporal checking is disclosed. A signal logger for performing temporal checking includes a group of edge detection modules and a group of counting modules. During testing, the signal logger is coupled to a device under testing (DUT). Each of the edge detection modules is capable of maintaining edge information after a state transition on a signal within the DUT has been detected. Each of the counting modules is associated with one of the edge detection modules. Each of the countering modules is capable of maintaining a clock cycle count information associated with a detected edge. After the testing has been completed, temporal checking information on a signal within the DUT can be obtained by reconstructing the edge information and the associated clock cycle count information of the signal collected during the test.