| 摘要 |
PURPOSE:To access an area more than a storage area by adding a physical address corresponding to one bank storage area out of selected ones to a border address when a bank storage area access instruction word is executed at the detection of a flag. CONSTITUTION:Data in a main storage part 39 which are specified by a memory address register 36 are read out by a memory data register 37, and when the read-out data are an instruction word, the data are set up in an instruction register 31. The instruction is analyzed by an instruction decoder 32. When the instruction is analyzed as an access instruction to an intra-bank address of the main storage part 39 by an operation code part and a flag part, data in a bank selection part and data in an operand part are inputted to a bank decoder part 35 and an adder 33 respectively. The operand data are added to data in a bank division register 34 by the adder 33 on the basis of a control signal and the added data are set up in the memory address register 36. |
