| 摘要 |
PURPOSE:To easily and surely perform retry controlling logic, by discriminating the possiblity of a retry from the executing content of a microinstruction when an instruction retry is not possible and making a microinstruction retry possible only in a prescribed extent. CONSTITUTION:A data processor 1 contains a control storage device 11 and processes an instruction fetched from a main storage device 2 by developing it to microinstructions. A service processor 3 has the maintaining and diagnosing functions of the processor 1, is connected with an external storage device 4, and houses a machine check processing routine. Data read out by the control storage device (CS) 11 is set in a register 12 and instructions are successively executed. When a machine check is detected during the execution of an instruction, the service processor 3 scans out contents of a check latch 14, retry controlling register (RC) 20, flag latch (FRNG) 21, etc., and successively executes check routine processes of a prescribed step. From the executed result, the possibility of an instruction retry or microinstruction retry is discriminated. |
