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发表于 2019-3-31 19:10:17
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During the fetch portion of the instruction cycle, the precessor first outputs the address of the instruction onto the address bus.
在程序循环的处理部分中,处理器首先把地址总线上的指令地址输出。
The precessor has a register called the program counter, the CPU keeps the address of the next instruction to be fetched in this register.
处理器有一个寄存器叫做程序计数器,CPU保持下一个指令地址在这个寄存器中被调取
Before the CPU outputs the address onto the system's address bus, it retrieves the address from the program counter register.
在CPU输出系统地址总线上的地址前,它检索这个程序计数器寄存器中的地址。
At the end of the instruction fetch, the CPU reads the instruction code from the system data bus.
在指令调取的最后,CPU阅读系统数据总线上的指令编码。
It stores this value in an internal register,usually called the instruction register or something similar.
它把这个值储存进一个内部的寄存器中,通常把它叫做指令寄存器或者相似的东西。
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