Patent ID: 7552372
Filing Date: 2009-06-23
Classification: G01R

Abstract:
1. A test method of a semiconductor device having bidirectional buffers connected to a boundary scan circuit, said method comprising: detecting a logic error by setting the bidirectional buffers uniformly to an output mode by an asynchronous setting circuit for asynchronously setting the bidirectional buffers to an input mode or to said output mode; if there is no logic error, integrating a plurality of input/output terminals connected to the bidirectional buffers and fixing the bidirectional buffers with the integrated input/output terminals uniformly to said input mode by the asynchronous setting circuit; setting a set value for setting the bidirectional buffers to a desired enable state to the boundary scan circuit and releasing the uniform input mode by the asynchronous setting circuit; and implementing a direct current (DC) test by the boundary scan circuit with the input/output terminals being integrated.