Patent ID: 6466007
Filing Date: 2002-10-15
Classification: G01R,G06K

Abstract:
An automatic test system of the type having a pattern generator for generating a stimulus pattern to be applied to a device under test and an expect pattern representing expected responses from the device under test, characterized in that the automatic test system includes synchronization circuitry, the synchronization circuitry having:a) at least one input (401) receiving a stream of data values from a device under test (114A . . . 114D); b) a comparator (418), coupled to the at least one input, having an output (402) indicating when a start condition is detected in the stream of data values from the device under test; c) a buffer circuit (424) receiving the stream of data values from the device under test and providing an output stream of data values that duplicates a portion of the stream of data values from the device under test, the portion selected based on the indication of the start condition from the comparator delayed a deterministic amount relative to the stream of data values from the device under test; d) wherein the output stream of the buffer circuit is coupled to the pattern generator for determining whether the device under test produced the expected response.