| 摘要 |
PURPOSE:To reduce the number of signals connected to an operation verifying circuit. CONSTITUTION:The operating results of a function circuit 9 are output as operating result outputs 8, and the operating results are verified whether they are correct or not by an operation verifying circuit 5. AND circuits 1 and 3, and NOR circuits 2 and 4 which are logical circuits are circuits unable to be verified sufficiently whether the operation is correct or not by only verifying the operation result outputs 8, and these logical circuits have a low frequency to make the output '1'. As a result, the outputs of these four logical circuits are added to the input end of an OR circuit 6, the logical sum is picked up from the signal line being the output end of the OR circuit 6, and it is verified by the operation verifying circuit 5. Even in such a way, a sufficient verifying is secured. |
