CSC-25 High Performance Architectures: Pipeline Control

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Questions and Answers

What type of instruction has a 16-bit field for Immediate?

S-type

J-type

R-type

I-type (correct)

What is the purpose of the 26-bit field in J-type instruction?

Specifies the immediate value

Specifies the register destination

Specifies the target address (correct)

Specifies the opcode

What is the name of the component that decides whether to take a branch or not?

Control Unit

Branch (correct)

Jump

RegDst

What is the input to the RegDst component?

Rt and Rd Signup and view all the answers

What is the purpose of the single cycle datapath?

To execute a single instruction in a single cycle Signup and view all the answers

What is the output of the Branch component?

Target address Signup and view all the answers

What is the role of the Jump component?

To execute a jump instruction Signup and view all the answers

What is the input to the Jump component?

PC and Target address Signup and view all the answers

What is the purpose of the Mux component in the given architecture?

To control the flow of data between registers and memory Signup and view all the answers

What is the function of the RegWr signal?

To enable writing to the register file Signup and view all the answers

What is the purpose of the AluCtrl component?

To perform arithmetic logical operations Signup and view all the answers

What is the purpose of the Mux in the datapath?

To select the source of the data for the ALU Signup and view all the answers

What is the function of the MemWr signal?

To enable writing to memory Signup and view all the answers

What is the purpose of the BusW component?

To control the flow of data between registers and memory Signup and view all the answers

What is the purpose of the Extender in the datapath?

To extend the 16-bit immediate value to 32 bits Signup and view all the answers

What is the function of the Rs and Rt components?

To specify the source registers for the ALU Signup and view all the answers

What is the role of the Clk signal in the datapath?

To clock the registers in the datapath Signup and view all the answers

What is the purpose of the PC[31:28] signal in the datapath?

To generate the address for the memory access Signup and view all the answers

What is the purpose of the MemToReg component?

To specify whether to write data from memory or the ALU Signup and view all the answers

What is the role of the Instruction[25:0] signal in the datapath?

To provide the immediate value for the instruction Signup and view all the answers

What is the function of the Zero component?

To indicate whether the result of the ALU operation is zero Signup and view all the answers

What is the purpose of the Addr[31:2] signal in the datapath?

To generate the address for the memory access Signup and view all the answers

What is the role of the AluSrc signal in the datapath?

To select the source of the data for the ALU Signup and view all the answers

What is the purpose of the Imm16 signal in the datapath?

To provide the 16-bit immediate value for the instruction Signup and view all the answers

Study Notes

Pipeline Control

MIPS instruction layout has two types: I-type and J-type instructions
I-type instruction has a 16-bit immediate field
J-type instruction has a 26-bit field for target address, applied to PC (Program Counter)

Single Cycle Datapath

Consists of five stages: Fetch, Decode, Execute, Memory, and Write Back
Fetch Unit retrieves instruction from memory
Registers are 32-bit and there are 32 registers
AluCtr (Arithmetic Logic Unit Control) controls the ALU (Arithmetic Logic Unit) operation
RegWr (Register Write) signal is used to write data back to registers
BusW (Bus Write) signal is used to write data to memory
Imm16 (Immediate 16) is used to extend the 16-bit immediate value to 32 bits

Instruction Fetch and Branch

PC (Program Counter) is used to store the address of the current instruction
Target address is calculated by adding the immediate value to the current PC value
Branch instructions use a 26-bit immediate value to calculate the target address

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Description

Lecture notes on pipeline control from Chapter III-B of High Performance Architectures, covering simple multiple cycle implementation and recap.