Controlling a datapath

@MJ · 0 min read

Created Date · 2024년 08월 16일 12:08

Last Update · 2024년 10월 20일 18:10

컴퓨터구조

contents: 0-1. CA Intro

Controlling a datapath

main control

Control signals are derived from given instructions

01 5.jpg

rs is always being read
rt is being read except when the instruction is lw.

- It is for loading

02 5.jpg

ALU control

Load / store instructions: add
Branch instructions: subtract
R-format instructions: depends on a function field in the instructions

03 4.jpg

Main Control Unit determines the ALUOp value
Whatever the funct codes are, if the opcode is lw, sw, or beq, ALU fuction is determined automatically

Previous Post

Processor Overview

Next Post

A single-cycle datapath