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?

<p>Rt and Rd (D)</p> Signup and view all the answers

What is the purpose of the single cycle datapath?

<p>To execute a single instruction in a single cycle (D)</p> Signup and view all the answers

What is the output of the Branch component?

<p>Target address (D)</p> Signup and view all the answers

What is the role of the Jump component?

<p>To execute a jump instruction (D)</p> Signup and view all the answers

What is the input to the Jump component?

<p>PC and Target address (A)</p> Signup and view all the answers

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

<p>To control the flow of data between registers and memory (B)</p> Signup and view all the answers

What is the function of the RegWr signal?

<p>To enable writing to the register file (A)</p> Signup and view all the answers

What is the purpose of the AluCtrl component?

<p>To perform arithmetic logical operations (A)</p> Signup and view all the answers

What is the purpose of the Mux in the datapath?

<p>To select the source of the data for the ALU (C)</p> Signup and view all the answers

What is the function of the MemWr signal?

<p>To enable writing to memory (C)</p> Signup and view all the answers

What is the purpose of the BusW component?

<p>To control the flow of data between registers and memory (C)</p> Signup and view all the answers

What is the purpose of the Extender in the datapath?

<p>To extend the 16-bit immediate value to 32 bits (C)</p> Signup and view all the answers

What is the function of the Rs and Rt components?

<p>To specify the source registers for the ALU (B)</p> Signup and view all the answers

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

<p>To clock the registers in the datapath (D)</p> Signup and view all the answers

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

<p>To generate the address for the memory access (B)</p> Signup and view all the answers

What is the purpose of the MemToReg component?

<p>To specify whether to write data from memory or the ALU (B)</p> Signup and view all the answers

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

<p>To provide the immediate value for the instruction (B)</p> Signup and view all the answers

What is the function of the Zero component?

<p>To indicate whether the result of the ALU operation is zero (A)</p> Signup and view all the answers

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

<p>To generate the address for the memory access (C)</p> Signup and view all the answers

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

<p>To select the source of the data for the ALU (A)</p> Signup and view all the answers

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

<p>To provide the 16-bit immediate value for the instruction (A)</p> 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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Related Documents

csc25-chapter_03b.pdf

Description

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

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