| 摘要 |
PURPOSE:To easily discriminate an abnormal operation causd by an abnormal branch, by discriminating an abnormal branch operation by the contents of a branch permission field of a microprogram of the branch destination. CONSTITUTION:A macro-instruction by the instruction code OP and the address Ad is read out and stored in the control memory control circuit 12 from the macro- instruction register 11 in which a source program is stored. Also, a miro-instruction by the micro-operation OPs and the address Ad is read out from the control memory 13 by selecting the address of the circuit 12, and it is sent out to the processor as a control signal 15. Also, a microprogram is read out to the register 14, subsequently it is decoded at every field, and when a branch destination condition has been formed by a branch instruction, etc., in case when the branch permission field E is ''1'', it is decided to be normal, and if it is ''0'', it is discriminated and displayed as an abnormal branch, and an abnormal operation is discriminated easily. |
