| 摘要 |
PURPOSE:To decrease the number of steps of microinstructions in a processor, by providing a boundary register at the side of a read/write memory instead of providing it in the inside of the processor. CONSTITUTION:Prior to the execution of a microinstruction for memory access, a boundary address is supplied as an intermediate-order address 10 among transfer addresses through an interface line 17 by one of processors 20-22 with a microinstruction to be set in a boundary register 7 by a strobe signal 16. An arithmetic unit 6 adds the intermediate-order address 10 and high-order address 11 to the said boundary address by an addition indication signal, and the result- ing address 15 is set in an address register 4 to attain access by using an access address consisting of the said address and a set low-order address 9. |
