Patent ID: 7286950
Filing Date: 2007-10-23
Classification: G01R

Abstract:
1. A testing device that tests a margin of an output signal output from an output terminal of a device under test by comparing the output signal with a predetermined pattern, comprising: a first signal comparator operable to acquire a value of each of output patterns included in an output pattern sequence output from the output terminal of the device under test based on a result that is obtained by comparing a voltage of the output signal and a first predetermined threshold value voltage in a first predetermined strobe timing, in order to acquire a first output pattern sequence output from the output terminal; a second signal comparator operable to acquire a value of each of output patterns included in an output pattern sequence output from the output terminal of the device under test based on a result that is obtained by comparing a voltage of the output signal and a second predetermined threshold value voltage in a second predetermined strobe timing, in order to acquire a second output pattern sequence output from the output terminal; a header pattern sequence detecting unit operable to detect that the first output pattern sequence is identical with a predetermined header pattern sequence; and an expectation comparing unit operable to output a comparison result between the second output pattern sequence acquired by said second signal comparator and an expectation pattern sequence of the second output pattern sequence when the header pattern sequence detecting unit detects that the first output pattern sequence is identical with the predetermined header pattern sequence.