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指令流程设计是CPU设计过程中的一个重要环节,在本刊上期《一台模型机的指令系统和CPU组成结构的设计》一文中介绍了该模型机的指令系统、寻址方式和模型机CPU及系统组成,本文对在此基础上设计的指令流程作一具体介绍。本模型机的指令流程包括取指周期FIC、取操作数周期FDC、各种指令的执行周期EXEC、中断响应周期INTC及DMA传送周期DMAC,限于篇幅,下面仅举几个工作周期的流程介绍如下:
Instruction flow design is an important part of the process of CPU design. In this issue of the article, “The design of a command system and a CPU structure of a model machine”, the instruction system, addressing mode and model machine CPU And system components, this article on the basis of the design of the instruction flow for a specific introduction. The instruction flow of the model machine includes an instruction fetch cycle FIC, an instruction fetch cycle FDC, an instruction execution cycle EXEC, an interrupt response cycle INTC, and a DMA transfer cycle DMAC. Due to limited space, the following is a brief introduction of the processes of a few work cycles :