| 摘要 |
PURPOSE:To improve the processing speed of a macroinstruction and to drastically reduce a microinstruction step by providing an operand address calculation circuit and using one microinstruction so as to calculate the operand address and to access the operand. CONSTITUTION:The operand address of the microinstruction is calculated and the operand address is given to a processing means 1 and a main storage control means 2 by an operand address calculation circuit 4. The processing means 1 reads and decodes the macroinstruction from a main storage device 3 storing in advance a program comprising macroinstructions via the main storage controller 2. The operand address calculation circuit 4 calculates the operand address of the macroinstruction and the operand is outputted to the processing means 1 and the main storage control means 2. Thus, one microinstruction is used to calculate the operand address and to execute the access of the operand.
|
