80386 Microprocessor Overview
43 Questions
0 Views

80386 Microprocessor Overview

Created by
@OptimalPoplar6930

Podcast Beta

Play an AI-generated podcast conversation about this lesson

Questions and Answers

What is the purpose of a scaling factor in index registers?

  • To multiply the index register contents for efficient array access (correct)
  • To convert the index register into a base register
  • To determine the type of data stored in memory
  • To increase the size of the memory address

    • Which memory addressing mode uses the displacement field directly to calculate the effective address?

  • Based Indexed Addressing
  • Register Indirect Addressing
  • Direct Addressing Mode (correct)
  • Scaled Indexed Addressing

    • Which of the following addressing modes is NOT mentioned in the content?

  • Based Addressing
  • Based Index mode with displacement
  • Indirect Addressing (correct)
  • Based Scaled Indexed Addressing

    • Which equation correctly describes the relationship between effective address and physical address?

    <p>PA = Segment Register : EA</p> Signup and view all the answers

    What is an invalid use of the ESP register according to the content?

    <p>Using ESP as an index register</p> Signup and view all the answers

    What does the Global Descriptor Table Register (GDTR) point to?

    <p>Global Descriptor Table</p> Signup and view all the answers

    Which of the following registers are utilized for hardware debugging in the 80386?

    <p>DR0 to DR3 and DR6 to DR7</p> Signup and view all the answers

    In Real Address Mode of 80386, what is the default operand size?

    <p>16 bits</p> Signup and view all the answers

    Which statement best describes the memory addressing in Real Mode for the 80386?

    <p>1 MB of physical memory with paging disabled</p> Signup and view all the answers

    Which of the following is true regarding the memory segments in Real Address Mode?

    <p>No protection is available for segments</p> Signup and view all the answers

    What is the purpose of the Task State Segment Descriptor (TSS)?

    <p>To manage task scheduling and context switching</p> Signup and view all the answers

    Which descriptor table is associated with handling interrupts in the 80386?

    <p>Interrupt Descriptor Table</p> Signup and view all the answers

    What role does the Local Descriptor Table Register (LDTR) serve in the 80386 architecture?

    <p>Points to the Local Descriptor Table</p> Signup and view all the answers

    What is the primary function of the memory management unit introduced in the 80386?

    <p>Manage the address space and memory allocation.</p> Signup and view all the answers

    Which of the following features distinguishes the 80386 from its predecessors like the 8086?

    <p>Introduction of a 32-bit data bus and address bus.</p> Signup and view all the answers

    What operating modes does the 80386 microprocessor support?

    <p>Real, protected, and virtual modes.</p> Signup and view all the answers

    What is the addressing capacity of the 80386?

    <p>4 GB</p> Signup and view all the answers

    Which version of the 80386 features a 24-bit address bus?

    <p>80386 SX</p> Signup and view all the answers

    How many addressing modes does the 80386 support?

    <p>11</p> Signup and view all the answers

    What technological advancement is the 80386 based on?

    <p>CMOS technology.</p> Signup and view all the answers

    What is the maximum operational speed of the 80386?

    <p>11.4 MIPS</p> Signup and view all the answers

    What happens to the most significant bits (MSB) when copying from a source of 8 bits to a destination of 16 bits?

    <p>Zeros are copied.</p> Signup and view all the answers

    Which instruction shifts specified bits from one operand to another in a left direction?

    <p>SHLD</p> Signup and view all the answers

    What is the purpose of the SHRD instruction?

    <p>Shift specified bits right from one operand to another.</p> Signup and view all the answers

    If the instruction SHLD EAX, ECX, 3 is executed, which bits from ECX are affected in the EAX register?

    <p>The upper 3 bits.</p> Signup and view all the answers

    What occurs after executing the instruction MOVZX EBX, AX?

    <p>AX is copied to EBX, with zeros in MSB.</p> Signup and view all the answers

    What does the operand 'count' specify in the SHLD and SHRD instructions?

    <p>The number of bits to shift right.</p> Signup and view all the answers

    After executing SHRD EAX, ECX, 4, how is EAX modified?

    <p>Upper bits of EAX are overwritten with lower bits of ECX.</p> Signup and view all the answers

    What is the result in the EBX register after executing MOVZX EBX, AX if AX is 1000 0111 1111 1110?

    <p>0000 0000 0000 0000 1000 0111 1111 1110</p> Signup and view all the answers

    What is the correct formula to calculate the Effective Address (EA) using base register and displacement?

    <p>EA = base register + displacement</p> Signup and view all the answers

    In which addressing mode is the contents of an index register multiplied by a scaling factor?

    <p>Scaled Indexed Addressing Mode</p> Signup and view all the answers

    Which addressing mode combines the contents of a base register and an index register to compute the Effective Address?

    <p>Based Indexed Addressing Mode</p> Signup and view all the answers

    Which expression is used to calculate the Physical Address (PA) in the case of effective addresses?

    <p>PA = DS + EA</p> Signup and view all the answers

    What is the primary function of the displacement in addressing modes?

    <p>To offset the base or index register for address calculation</p> Signup and view all the answers

    Which example demonstrates the Indexed Addressing Mode?

    <p>MOV ESI,[EBX]</p> Signup and view all the answers

    In the Scaled Indexed Addressing Mode with displacement, what factors contribute to calculating the Effective Address?

    <p>Index register multiplied by a scaling factor and base register</p> Signup and view all the answers

    Which mode uses both the base register and the index register along with displacement?

    <p>Based Indexed Addressing Mode with displacement</p> Signup and view all the answers

    What is the formula for the Effective Address in Based Scaled Indexed Addressing Mode?

    <p>EA = (index register * scaling factor) + base register</p> Signup and view all the answers

    In Register Indirect Addressing Mode, which register is commonly used to directly find the Effective Address?

    <p>ECX</p> Signup and view all the answers

    What distinguishes Based Scaled Indexed Addressing Mode from standard Based Addressing Mode?

    <p>The multiplication of an index register by a scaling factor</p> Signup and view all the answers

    Which of the following correctly represents the Effective Address in the Based Indexed Addressing Mode?

    <p>EA = base register + index register + displacement</p> Signup and view all the answers

    What is the purpose of segment registers in addressing modes?

    <p>To define a starting address in memory for data access</p> Signup and view all the answers

    When computing the Effective Address, which of the following aspects is NOT typically involved?

    <p>Immediate value</p> Signup and view all the answers

    Study Notes

    80386 Microprocessor

    • 80386 was released in 1985 by Intel
    • 32 bit address bus and 32 bit data bus
    • 4 GB addressing capacity
    • Clock speeds of 20 - 33 MHz
    • 132 pins
    • Included a memory management unit
    • Compatible with 8086, 8088, and 80286 processors
    • Operates in Real, Protected, and Virtual modes
    • Introduced Paging and Virtual Memory
    • CMOS technology
    • Contains 275,000 transistors
    • Operates at 11.4 MIPS
    • 11 addressing modes
    • Pipelined architecture

    80386 Versions

    • 80386 DX: 32 bit Address Bus, 32 bit Data Bus, 132 pins
    • 80386 SX: 24 bit Address Bus, 16 bit Data Bus, 100 pins

    Register Set

    • Global Descriptor Table (GDT)
    • Interrupt Descriptor Table (IDT)
    • Local Descriptor Table (LDT)
    • Task State Segment Descriptor (TSS)
    • Task Register (TR)
    • Global Descriptor Table Register (GDTR)
    • Interrupt Descriptor Table Register (IDTR)
    • Local Descriptor Table Register (LDTR)

    Debug and Test Registers

    • 8 debug registers. Used for hardware debugging.
    • DR0 to DR3 store breakpoint adresses
    • DR6 and DR7 store breakpoint status and control information
    • 2 test registers for page caching: Test Control and Test Status Register

    Real Mode of 80386

    • Starts from memory location 0 after reset
    • Operates as a faster version of the 8086
    • Default operand size: 16 bit
    • Segment size: 64 KB
    • Overlapped or non-overlapped segments
    • No protection is available
    • ESP can not be used as an index register

    Memory Addressing in Real Mode

    • 1 MB of physical memory
    • Paging unit is disabled
    • Address generation is the same as the 8086
    • No protection is available

    Addressing Modes

    • Direct Addressing: EA is taken from the displacement field of the instruction.
    • Register Indirect Addressing: EA is taken from a base or index register.
    • Based Addressing: EA is calculated by adding the contents of a base register to a displacement.
    • Indexed Addressing: EA is calculated by adding the contents of an index register to a displacement.
    • Scaled Indexed Addressing: EA is calculated by multiplying the contents of an index register by a scaling factor and adding the result to a displacement.
    • Based Indexed Addressing: EA is calculated by adding the contents of a base register to the contents of an index register
    • Based Scaled Indexed Addressing: EA is calculated by multiplying the contents of an index register by a scaling factor, adding the result to the contents of a base register.
    • Based Index mode with displacement: EA is calculated by adding the contents of a base register to the contents of an index register and a displacement.
    • Based Scaled mode with displacement: EA is calculated by multiplying the contents of an index register by a scaling factor, adding the result to the contents of a base register and a displacement.

    80386 Pin Description

    • A0 and A1 pins are encoded in Bus Enable to select any or all 4 bytes of a 32-bit wide memory
    • The destination of data moves can be either 16 or 32 bit registers
    • If the source is 8 bit and the destination is 16 bit, zeros are copied to the upper 8 bits of the destination
    • If the source is 16 bit and the destination is 32 bit, zeros are copied to the upper 16 bits of the destination.

    Instructions

    • MOVZX: Copies a value from a smaller source register to a larger destination register, filling the unused bits with zeros.
    • SHLD (SHIFT LEFT DOUBLE): Shift left from one operand to another. Shifts specified number of bits left from one operand to another.
    • SHRD (SHIFT RIGHT DOUBLE): Shift right from one operand to another. Shifts specified number of bits right from one operand to another.

    Studying That Suits You

    Use AI to generate personalized quizzes and flashcards to suit your learning preferences.

    Quiz Team

    Related Documents

    UNIT_3[1] - Read-Only.pptx

    Description

    This quiz covers the key features and specifications of the 80386 microprocessor, including its architecture, addressing capabilities, and variations. Test your knowledge on the different modes of operation, register sets, and debug registers associated with this historic Intel chip.

    More Like This

    Intel 8086 and 8088 Microprocessors
    5 questions

    Intel 8086 and 8088 Microprocessors

    ComprehensiveSerpentine6029 avatar
    ComprehensiveSerpentine6029
    Microprocessor 8086: Historical Overview Quiz
    12 questions

    8086 Microprocessor Test: Historical Overview Quiz and Flashcards

    FondUniverse avatar
    FondUniverse
    Intel 8086 Microprocessor Architecture
    37 questions

    Intel 8086 Microprocessor Architecture

    ThumbUpHyperbole avatar
    ThumbUpHyperbole
    Processeur Intel 8086
    24 questions

    Processeur Intel 8086

    TougherMountRushmore2090 avatar
    TougherMountRushmore2090
    Use Quizgecko on...
    Browser
    Open
    Browser
    Browser