| 摘要 |
PURPOSE:To prevent an abnormal output of data caused by a degeneration fault and the like of a flip-flop, by installing plural flip-flops showing whether an input data is effective or not at every input data. CONSTITUTION:Display flip-flops A/S0 and A/S00 plus A/S1 and A/S10 are controlled by a control means to secure the same state at all times. When the filp-flops A/S0 and A/S00 are 0 and A/S1 and A/S10 are 1, an input data D00 on a data line dl0 is transmitted in the form of an output data D00. And an input data D11 is not transmitted. Under such conditions, the data D11 is never transmitted although a degeneration fault occurs at either one of flip-flops A/S1 and A/S10. As a result, a degeneration fault if occurs does not affect the transmission of data to prevent an abnormal output of data. |
