论文部分内容阅读
MC68451存贮器管理单元(MMU)对MC68000MPU 的16兆字节寻址范围提供地址转换和保护。在 M68000系列中的每个总线主设备(或处理器)在每个总线周期期间提供功能码和地址。功能码规定了一个地址空间而地址则在地址空间内规定一个单元。功能码区分用户和管理程序空间,在此空间范围内区分出数据和程序空间。地址空间的
The MC68451 Memory Management Unit (MMU) provides address translation and protection of the MC68000MPU’s 16-megabyte addressing range. Each bus master (or processor) in the M68000 Series provides function codes and addresses during each bus cycle. The function code specifies an address space and the address specifies a cell in the address space. Function code distinguishes between user and hypervisor space, distinguishing between data and program space within this space. Address space