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基于 FPGA 的 RISC CPU 设计(4)关于项目的 36 个问题及其答案
2022-06-29 01:38:00 【新芯设计】
CPU 的微架构?ALU 出来的数据通路,IDec 出来的控制通路,各种功能部件,分别通过数据通路和控制通路相互连接形成了 CPU 的微架构;
指令数量?33 个(RISC 精简指令集架构);
指令宽度?12 位(= 指令字长);
数据宽度?8 位(= 机器字长 = 寄存器的宽度);
哈佛架构?指令总线和数据总线是独立分开的,指令和数据的宽度可以不同了,从而改善了带宽
总线是什么呢?总线就是能够为多个部件分时共享的一组信息传输通路;
指令存储器?2K X 12(EPROM)(= 程序存储器);
数据存储器?72 X 8(RAM)(= 通用寄存器 = 寄存器文件 = 寄存器堆);
编址方式?存储器以字节编址的方式;
小端模式?小地址对应着数据的低位;
特殊功能寄存器?8 个&
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