Patent ID: 7260493
Filing Date: 2007-08-21
Classification: G01R

Abstract:
1. A method of testing a device under test, which is adapted to transmit a digital data signal and a clock signal, the data signal being related to the clock signal, to a test device, comprising the steps of: sampling within one clock cycle of a local clock signal the data signal and the clock signal by applying a number of strobes for obtaining a corresponding number of bit values each for the data signal and for the clock signal, the strobes having different phase offsets with respect to the local clock signal, deriving first comparison results for the sampled bit values of the data signal by comparing the sampled bit values of the data signal each with an expected data bit value according to expected data, deriving second comparison results for the sampled bit values of the clock signal by comparing the sampled bit values of the clock signal each with an expected clock bit value, deriving combined comparison results by applying logical operations each on pairs of corresponding first comparison result and second comparison result, deriving a test result for the data of said clock cycle based on the combined comparison results, and outputting said test result for further use.