| 摘要 |
PURPOSE:To detect which FF is faulty, too, by connecting an FF of a testing shift path to a selector, and controlling this selector from the outside. CONSTITUTION:A bit serial test signal is supplied to FFs 3a, 3b... for forming a shift path from a shift-in terminal 4, outputted from a shift-out terminal 5, and the shift path is diagnosed. These FFs 3a, 3b... are connected to a selector 10, and when the selector 10 is controlled by an external signal passing through an address register 15, the outputs of desired FFs 3a, 3b... are outputted to a selector output terminal 13, and which FF of 3a, 3b... is faulty can be detected. |
