| 摘要 |
PURPOSE:To prevent the execution of a microinstruction from being delayed by writing the microinstruction in a period wherein a control memory need not be read out by the control memory error correction device which writes the microinstruction in the control memory when an correctable error is detected in the microinstruction. CONSTITUTION:When the error detecting and correcting circuit 108 detects the correctable error in the microinstruction stored in a microinstruction register 103, the circuit 108 corrects the error and sends an inhibition signal to an NOP instruction indication FF 104, an arithmetic circuit 107, and a correction address register 110 so that respective registers are not updated. Then the corrected microinstruction is stored in registers 103 and 113 and an FF 109 is set. In a next cycle 109, the inhibition signal is sent to registers 110 and 113, which are prevented from being updated. Then an NOP instruction is executed to write the error-corrected microinstruction in a control memory 102. |
