无论何时从内存中取一个指令，指令指针都会经指令tlb的翻译后指向物理地址。
Whenever an instruction is fetched from memory, the instruction pointer is translated via the instruction TLB into a physical address.
它从存储器中取指令，提供存储器需要的地址和控制信号。
It fetches instructions from memory, supplying the address and control signals needed by memory to access its data.
为了简化他们选择在PC暴露当前指令的地址取指令，而不是当前正在执行的指令的设计。
To simplify the design they chose to have the PC expose the address of the current instruction fetch, rather than the currently executing instruction.
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