| 摘要 |
PURPOSE:To inhibit next address writing to a microprogram address register when a fault is detected by checking a microprogram read out from a control memory unit before it is written to a latch register. CONSTITUTION:Before being written to latch register ML, a microprogram read out from control memory unit CROM is checked by microprogram error check circuit CHK. If a fault occurs, FF is set and a write pulse to microprogram memory address register MPR is cut off via inhibition gate G. In this way, if control memory part CROM is in trouble, it is detected and microprogram address register MPAR is frozen at a fault-element position, so that the information can be given by supplying it to IND2. |
