Homework Help is Here – Start Your Trial Now!
Engineering
Computer Science
Consider the following MIPS instruction:  add $t1, $t2, $t3 What is the ALUSrc control signal value: top or bottom? What is the MemtoReg control signal value: top or bottom? What is the PCSrc control signal value: top or bottom?

Consider the following MIPS instruction:  add $t1, $t2, $t3 What is the ALUSrc control signal value: top or bottom? What is the MemtoReg control signal value: top or bottom? What is the PCSrc control signal value: top or bottom?

Database System Concepts
Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Chapter1: Introduction
Section: Chapter Questions
Problem 1PE
See similar textbooks
icon
Related questions
Question

  1. Consider the following MIPS instruction:  add $t1, $t2, $t3

    1. What is the ALUSrc control signal value: top or bottom?
    2. What is the MemtoReg control signal value: top or bottom?
    3. What is the PCSrc control signal value: top or bottom?
This image illustrates a simplified schematic of a single-cycle CPU datapath, highlighting the flow of data and control signals within the processor. The diagram consists of several key components and pathways connected to facilitate instruction execution. ### Components and Pathways: 1. **PC (Program Counter):** - Keeps track of the next instruction address. The PC outputs to an adder and to the instruction memory. 2. **Instruction Memory:** - Receives the address from the PC and outputs the instruction. This instruction is fed to various other components in the system. 3. **Registers:** - Contains read and write registers and data inputs/outputs. The read register sections output data to the ALU and a multiplexer (Mux). 4. **Adders:** - There are two adders: - The first one adds a constant (4) to the PC to get the next sequential instruction address. - The second adds the ALU result. 5. **ALU (Arithmetic Logic Unit):** - Responsible for performing operations specified by the ALU operation control signals. It outputs a result and a zero signal indicating if the result is zero. 6. **Sign-extend:** - Extends the immediate value from 16 bits to 32 bits. This output can be directed to the ALU for arithmetic operations via a Mux. 7. **Shift Left 2:** - Shifts the sign-extended value left by two bits, typically used for calculating branch target addresses. 8. **Data Memory:** - Interacts with the ALU result for address input and supports read/write operations with control signals (MemWrite and MemRead). 9. **Multiplexers (Mux):** - Used to select between different data inputs. Three main multiplexers are shown: - At the PC source, deciding the next address based on control signals. - At the ALU source, selecting between register data and sign-extended data. - At the ALU result, allowing data memory output or ALU result to be written back to registers. ### Control Signals: - **RegWrite:** Enables writing data to the register. - **PCSrc:** Controls PC Mux for determining next instruction address. - **ALUSrc:** Selects input data source for the ALU. - **MemtoReg:** Selects data to write back to registers from ALU or data memory. - **MemRead:** Enables
Transcribed Image Text:This image illustrates a simplified schematic of a single-cycle CPU datapath, highlighting the flow of data and control signals within the processor. The diagram consists of several key components and pathways connected to facilitate instruction execution. ### Components and Pathways: 1. **PC (Program Counter):** - Keeps track of the next instruction address. The PC outputs to an adder and to the instruction memory. 2. **Instruction Memory:** - Receives the address from the PC and outputs the instruction. This instruction is fed to various other components in the system. 3. **Registers:** - Contains read and write registers and data inputs/outputs. The read register sections output data to the ALU and a multiplexer (Mux). 4. **Adders:** - There are two adders: - The first one adds a constant (4) to the PC to get the next sequential instruction address. - The second adds the ALU result. 5. **ALU (Arithmetic Logic Unit):** - Responsible for performing operations specified by the ALU operation control signals. It outputs a result and a zero signal indicating if the result is zero. 6. **Sign-extend:** - Extends the immediate value from 16 bits to 32 bits. This output can be directed to the ALU for arithmetic operations via a Mux. 7. **Shift Left 2:** - Shifts the sign-extended value left by two bits, typically used for calculating branch target addresses. 8. **Data Memory:** - Interacts with the ALU result for address input and supports read/write operations with control signals (MemWrite and MemRead). 9. **Multiplexers (Mux):** - Used to select between different data inputs. Three main multiplexers are shown: - At the PC source, deciding the next address based on control signals. - At the ALU source, selecting between register data and sign-extended data. - At the ALU result, allowing data memory output or ALU result to be written back to registers. ### Control Signals: - **RegWrite:** Enables writing data to the register. - **PCSrc:** Controls PC Mux for determining next instruction address. - **ALUSrc:** Selects input data source for the ALU. - **MemtoReg:** Selects data to write back to registers from ALU or data memory. - **MemRead:** Enables
Expert Solution
trending now

Trending now

This is a popular solution!

steps

Step by step

Solved in 2 steps

SEE SOLUTIONCheck out a sample Q&A here
Blurred answer
Knowledge Booster
Fundamentals of Computer System
Learn more about
Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, computer-science and related others by exploring similar questions and additional content below.
Recommended textbooks for you
Database System Concepts
Database System Concepts
Computer Science
ISBN:
9780078022159
Author:
Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:
McGraw-Hill Education
Starting Out with Python (4th Edition)
Starting Out with Python (4th Edition)
Computer Science
ISBN:
9780134444321
Author:
Tony Gaddis
Publisher:
PEARSON
Digital Fundamentals (11th Edition)
Digital Fundamentals (11th Edition)
Computer Science
ISBN:
9780132737968
Author:
Thomas L. Floyd
Publisher:
PEARSON
C How to Program (8th Edition)
C How to Program (8th Edition)
Computer Science
ISBN:
9780133976892
Author:
Paul J. Deitel, Harvey Deitel
Publisher:
PEARSON
Database Systems: Design, Implementation, & Manag…
Database Systems: Design, Implementation, & Manag…
Computer Science
ISBN:
9781337627900
Author:
Carlos Coronel, Steven Morris
Publisher:
Cengage Learning
Programmable Logic Controllers
Programmable Logic Controllers
Computer Science
ISBN:
9780073373843
Author:
Frank D. Petruzella
Publisher:
McGraw-Hill Education
SEE MORE TEXTBOOKS