| 摘要 |
PURPOSE:To attain highly speedy accessing by providing a flag for discrimination at the time of mapping concerning the process to access the own system memory space only. CONSTITUTION:The access processing of an address signal is divided into three types of the route, to execute the access processing of three types of the route, a flag for discrimination is provided concerning a judgement 1 and the prescribed bit for identification is provided in a mapping table concerning a judgement 2. The three types of such a access processing can be executed, and the selection is designated at the time of the mapping before the execution of a process. Namely, when the mapping is executed by using an own system memory space K1 only, a mapping 1 of a other system memory space K2 is vanished. In such a case, the memory space is absent when the space is occupied by the own system protection table, etc. In such a case, the referring of the mapping table and the converting of an address are omitted, a prescribed address signal A1 is used and the accessing can be executed directly at a high speed.
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