| 摘要 |
PURPOSE:To shorten an address comparison time portion by executing an access request to a system storage and a local storage without executing the comparison,in case of a system storage access mode state. CONSTITUTION:When a mode setting register is '1', in an access request controlling circuit, an access request is executed to a system storage and a local storage 1. Thereafter, an address comparison is executed 3, and in case of being larger than an address C, an access of the system storage is made effective, and an access of the local storage is made ineffective 4. As a result of the address comparison, when the request address is smaller than the address C, the system storage access is made ineffective 5, and the local storage access is made effective 6. Accordingly, in case when the mode setting register is '1', namely, in a state of a system storage access mode, the comparison is not executed and the access request is executed. |
