| 摘要 |
PURPOSE:To prevent a macro instruction performing a block data transfer of plural words from occupying a long time in a processing time when a bus error generates owing to the abnormality of a bus access time monitoring, regarding the data transfer by a CPU of a micro-program control system. CONSTITUTION:In an interpreter performing a N-word block transfer for 16-bit data, a retry processing is performed by an interruption processing when a bus error generates in the data transfer operation of 16-bit read (SC2) or 16-bit write (SC3). When the retry processing is failed, it is recovered by turning a retry failure flag register on. The interpreter moves to the decoding execution of the macro-instruction of a system control program processing by the immediate interruption of a system task level in a MAP processing when a flag register is turned on and at the same time turns the flag register off. |
