| 摘要 |
PURPOSE:To prevent the regeneration of an error by detecting a generated uncorrectable error, storing its address, informing the address and then rewriting data in the address in case of accessing to a control storage for a microprogram. CONSTITUTION:The control storage 2 is read out by an address specified by a register 6 and checked by an ECC circuit 3. When a one-bit error is detected, the corrected data are sent to a register 4, and if uncorrectable 2-bit error is detected, an error detecting circuit 7 opens a gate 8 and stores the address of the generated error of the control storage 2 which is specified by the register 6 in a trace memory 9. When the error signal is sent from the detecting circuit 7, an arithmetic circuit 5 reports the signal to the upper device through a terminal A and starts a loader circuit 1. Then the arithmetic circuit 5 reads out the trace memory 9, informs the address of the generated error to a loader circuit 1 and rewrites the corrected data in the address. Thus, rewriting is attained easily and the regeneration of the error can be prevented. |
