| 摘要 |
PURPOSE:To prevent a device from executing the unfair action due to the malfunction of hardware, and the error of a micro-program or the like by providing an agent register, and a decoder or the like at a micro instruction control part. CONSTITUTION:In a micro-instruction control part 2, a micro-instruction first, is stored to a microprogram memory 11. Next, the contents of the address instructed by a micro-instruction address register 13 are read to a micro- instruction register 12, decoded by a decoder 14 and executed. At this time, when the control request from respective processing parts 3-1 to 3-4 is received, an agent number corresponding to respective processing parts is set to an agent register 15 and held until the control of a processing part 2 is completed. When the micro-instruction is decoded by the decoder 14, the contents of the register 15 are referred to, it is decided whether or not the micro-instruction decoded at present is effective and only at the time of being effective, execution is carried out. Thus, the unfair action of the device due to the malfunction, etc., of the hardware can be prevented. |
