| 摘要 |
PURPOSE:To easily specify a faulty part, by adding an inhibiting circuit, and inhibiting fault information through a combining circuit from a fault generation source. CONSTITUTION:A fault detected by a fault detecting circuit 14 in accordance with an output data from a combining circuit 4 is fatched by a signal 64, and is inputted to a 3-input AND43 and a 2-input AND44 of an inhibiting circuit part5. To the other input terminal of the 3-input AND43, output signals 61, 62 of fault detecting circuits 11, 12 of registers 1, 2 are inputted through inverters 41, 42, and set a fault information holding part 24 by taking OR with an AND output of a flip-flop 40 which becomes ''1'' at the time of testing whether the detecting circuit 14 is normal or not. According to this operation, a data containing a fault is not set to a fault holding circuit part corresponding to the combining circuit in accordance with a register in which the fault has occurred, therefore, the faulty part is specified easiy. |
