| 摘要 |
An improved memory management unit (MMU) for interfacing between a CPU and a main computer memory to convert logical addresses to physical addresses. The MMU's memory 20 provides sufficient capacity to permit relocation data and limit data to be stored for a plurality of processes, and thus, allows several programs to be run without reprogramming the MMU. Special "access" bits are also stored in the MMU's memory which, by way of example, prevent the writing into program, accessing of unselected processes or user access to certain memory locations to prevent, for instance, the copying of an operating system. <IMAGE> |
