Patent ID: 6459290
Filing Date: 2002-10-01
Classification: G01R

Abstract:
A test apparatus of a plurality of integrated circuits configured in a matrix array comprising rows and columns, each integrated circuit of the matrix array including a self-diagnostic circuit of which diagnostic result is outputted and controlled by at least one control signal being supplied from an outside of the matrix array, wherein respective diagnostic results of self-diagnostic circuits of the matrix array are supplied to a monitor and controlled by the at least one control signal so that one of the diagnostic results is selected, each integrated circuit of the matrix array further comprising:a set of input terminals to which a set of control signals are respectively supplied; an output terminal for outputting the self-diagnostic result; and a tri-state buffer in which an output-disable state or an output-enable state of the diagnostic result is controlled by a combination of the set of control signals; the test apparatus further comprising: a set of control signal lines associated with each of said rows, and respective control signal lines of each set being commonly connected to respective input terminals of said set of input terminals of each of the integrated circuits in the respective row for inputting the set of control signals; and an output signal line associated with each of said columns, each output signal line being commonly connected to the output terminal of each integrated circuit in the respective column for outputting the diagnostic results, and each output signal line being commonly connected to the monitor; wherein any one of the integrated circuits of a row is selected by the set of control signals so that an output of the diagnostic results of the selected integrated circuit of the row is set to be enable while outputs of the diagnostic results of other sub-integrated circuits of the row are set to be disable, and said diagnostic results of the row are supplied to the monitor.