SPS5710 51199929-100 电源模块微程序微程序控制(简称微码控制)的基本思路是:用微指令产生微操作命令, -条指令的功能通过执行一 系列基本操作来完成， 这些基本操作称为微操作，每个微操作在相应控制信号的控制下执行,这些控制信号在微程序设计中称为微命令。微程序是一个微指令序列， 对应于一条机器指令的功能，每条微指令是一个0/1例， 中包含若干个微命令，它完成一 个基本运算或传送功能，有时也将微指令字,称作控制字(controlword)。微程序控制器的组成:1、控制存储器 (Control Memory)用来存放各机器指令对应的微程序。译码器用来形成机器指令对应的微程序的入口地址。当将一条机器指令对应的微程序的各条微指令逐条取出, 并送到微指令寄存器时，其微操作命令也就按事先的设计发出，因而也就完成了一条机器指令的功能。对每一条机器指令都是如此。 2、 微指令的宽度直接决定了微程序控制器的宽度。为了简化控制存储器，可采取一些措施来缩短微指令的宽度。如采用字段译码法一级分段译码。 显然,微指令的控制字段将大大缩短。，一些要同时产生的微操作命令不能安排在同一 个字段中。为为了进-步缩短控制字段,还可以将字段译码设计成两级或多级。CPU 控制器是指挥计算机的各个部件按照指令的功能要求协调工作的部件,是计算机的神经中枢和指挥中心，由指令寄存器IR (InstructionRegister) 、程序计数器PC (ProgramCounter) 和操作控制器OC
The basic idea of microprogramming control (abbreviated as microcode control) is to generate micro operation commands using micro instructions. The functions of each instruction are completed by executing a series of basic operations, which are called micro operations. Each micro operation is executed under the control of corresponding control signals, which are called micro commands in microprogramming design. A microprogram is a sequence of micro instructions that correspond to the functionality of a machine instruction. Each micro instruction is a 0/1 example and contains several micro commands that perform a basic operation or transfer function. Sometimes, a micro instruction word is also referred to as a control word. The composition of a microprogram controller: 1. Control Memory is used to store the microprograms corresponding to each machine instruction. The decoder is used to form the entry address of the microprogram corresponding to machine instructions. When each micro instruction corresponding to a machine instruction is taken out one by one and sent to the micro instruction register, its micro operation command is also issued according to the previous design, thus completing the function of a machine instruction. This is true for every machine instruction. 2. The width of the micro instruction directly determines the width of the micro program controller. To simplify control memory, some measures can be taken to shorten the width of micro instructions. If the field decoding method is used for first level segmented decoding. Obviously, the control field of micro instructions will be greatly shortened., Some micro operation commands that need to be generated simultaneously cannot be arranged in the same field. In order to further shorten the control field, the field decoding can also be designed as two-level or multi-level. The CPU controller is a component that commands the coordination of various components of a computer according to the functional requirements of instructions. It is the neural center and command center of the computer, composed of instruction register IR (InstructionRegister), program counter PC (ProgramCounter), and operation controller OC
扫一扫咨询微信客服
