RETRIAL SYSTEM FOR TRANSFER INSTRUCTION IN DATA PROCESSOR

摘要

PURPOSE:To improve the reliability of a data processing unit by starting the retrial of the firmware based on the 1st operand length, the 2nd address and the 2nd operand length when a specific condition is confirmed. CONSTITUTION:The 1st address, the 1st operand length, the 2nd address and the 2nd operand length are stored in registers 105, 110, 106 and 111 at the start of the move instruction. After the content in the main storage is rewritten by the execution of the present instruction, even if a hardware error takes place and the retrial is disabled, a flip-flop 126 represents the move instruction execution and when it is confirmed that the content of the 1st main storage operand is not rewritten by the execution of the move instruction of itself based on the said 4-set of information stored, the retrials of the firmware is started based on the said 4-set of information. Thus, the retrial rate of the move instruction of the entire data processing unit is improved considerably to improve the reliability of the data processing unit.