Patent ID: 7965093
Filing Date: 2011-06-21
Classification: G01R

Abstract:
1. A test apparatus for testing a device under test, comprising: a multi-strobe generating section that generates, for each prescribed test cycle, a multi-strobe that includes a plurality of strobes arranged at prescribed time intervals; a data detecting section that detects a logic value of a response signal output by the device under test, according to each strobe; and a period detecting section that detects a matching period during which the logic value of the response signal matches a prescribed expected value, based on each change point of a logic value output by the data detecting section, wherein when (i) a first change point at which the logic value of the response signal changes to the expected value and (ii) a second change point at which the logic value of the response signal changes from the expected value are detected with a single multi-strobe, the period detecting section detects the matching period based on positions of the first change point and the second change point, and when (i) a second change point at which the logic value of the response signal changes from the expected value is not detected after (ii) a first change point at which the logic value of the response signal changes to the expected value is detected, with a single multi-strobe, the multi-strobe generating section adjusts the position of the multi-strobe until a second change point at which the logic value of the response signal changes from the expected value is detected after the first change point at which the logic value of the response signal changes to the expected value is detected.