| 术语 | operation cycle |
| 释义 | operation cycle 操作周期 1.The series of operations that the CPU goes through. First, it fetches the word containing its next instruction from memory using the address in the program counter. The instruction is loaded into the instruction register and a one(1) is added to the program counter. The CPU decodes the instruction. If necessary, the CPU computes an effective address and places it in the address register. Finally, the CPU executes the instruction and prepares to start the cycle over again. CPU 执行一系列操作的时间。首先,按照程序计数器中的地址从存储器中取出含有下一条指令的 字,把指令装入指令寄存器,同时程序计数器加“1”。CPU对指令译码,如果需要,CPU就计算有效地 址并把它放进地址寄存器。最后,CPU执行该指令,并准备再启动整个周期。 2.Relates specifically to that portion of a machine cycle during which the actual execution of the instruction takes place. Some operations (divide, multiply) may need a large number of these operation cycles to complete the operation, and the normal instruction／operation alternation will be held up during this time. 特指机器周期中实际执行指令的那段时间。某些操作,例如乘、除运算需要很多个操作周期才能完 成,在此期间将停止正常的指令与操作的交替。同execution cycle。 |
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