| 摘要 |
PURPOSE:To evaluate output data even at an asynchronizing circuit by electrically separating a hand shake part and a data processing part at the time of a test, processing test data synchronized with a prescribed clock in the data processing part and synchronizing the output signal with the test data. CONSTITUTION:Asynchronizing circuits 5a and 5b are interfaces interposing between an external part and a microprocessor 1. The asynchronizing circuit 5a is equipped with a hand shake part 3a and a data processing part 4a, and the asynchronizing circuit 5b is equipped with a hand shake part 3b and a data processing part 4b. When executing the test, mode select signals are applied from test signal generation circuits 8 and 10 to mode select circuits 7 and 9. In response to these mode select signals, the mode select circuits 7 and 9 separate the hand shake parts and the data processing parts, and the test data synchronized to the prescribed clock are applied to the data processing parts. A signal exerting a prescribed processing upon the test data of the data processing part is applied to an output data evaluation circuit 12. Based on this prescribed clock, the output data evaluation circuit 12 evaluates signals from the data processing parts. |
