| 摘要 |
PURPOSE:To enable removal of causes of system down by executing retry of instruction that caused an error operating a retry controlling circuit in response to output of an instruction error detecting device and an instruction completion detecting device. CONSTITUTION:Suppose that an error occurred in A state of an instruction n during processing of pipeline of an instruction. This error is detected by a detecting circuit 2 and reported to a gate G2, and operation of the gate is stopped to stay in the state A. Each state of preceding instructions n-2, n-1 is executed, and completion of execution of instruction n-1, i.e. completion of W state is detected by a detecting circuit 4. When this detection signal is reported to a retry controlling circuit 3, the retry controlling circuit 3 executes retry of instruction n response to the signal and a signal sent from the error detecting circuit 2. |
