Patent ID: 7243283
Filing Date: 2007-07-10
Classification: G01R

Abstract:
1. A semiconductor device having a plurality of electric circuits having the same configuration, which are mounted on the same semiconductor chip, the semiconductor device comprising: a plurality of comparison circuits that compare an output value and an expected value of each electric circuit, the comparison circuits being individually provided per one electric circuit, and a plurality of output selection circuits individually provided per one electric circuit, wherein the electric circuit, the comparison circuit, and the output selection circuit are daisy-chained such that when respective input values of the comparison circuits corresponding to the electric circuits coincide with each other, an output value of the corresponding electric circuit is directly output from the corresponding output selection circuit as the expected value of another comparison circuit, whereas when respective input values of the comparison circuits do not coincide with each other, a fixed value is output from the corresponding output selection circuit, wherein when the same test signal is input to each electric circuit, the comparison result of at least one of the comparison circuits is output as the test results.