| 摘要 |
PURPOSE:To check a retrying circuit accurately by providing a pseudo fault generating circuit with mechanism which clocks a prescribed time, and thus generating a pseudo fault signal for the prescribed time when the pseudo fault generating circuit is started. CONSTITUTION:Instructions are executed by an instruction executing circuit 1, whose execution results are checked by a checking circuit 2. If this circuit 2 detects an error, the execution of the instructions is retried under the control of a retry control circuit 4. At this time, a pseudo fault generating circuit 4 provided with a counter 4' generates and send a pseudo fault signal to the executing circuit 1 and checking circuit 2 for a prescribed time set in the counter 4'. Then, the checking circuit 2 sends an error signal to a control circuit 3 until the timer 3' reaches the prescribed time, and once no error is found, the control is returned to the normal conditions to eliminate overretrying, thus preventing the operation of the computer from being stopped. |
