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Computer Architecture: Memory Segmentation
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Computer Architecture: Memory Segmentation

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Questions and Answers

In the Intel Memory Address Generation, what is the purpose of the segment register?

  • Store the memory addresses of instructions and data
  • Specify the starting location of a memory segment (correct)
  • Add to the offset value to generate the physical address
  • Determine physical memory addresses
  • What is the role of the Address registers?

  • Store the memory addresses of instructions and data (correct)
  • Specify the starting location of a memory segment
  • Determine physical memory addresses
  • Add to the offset value to generate the physical address
  • What is the significance of the Offset Value in memory addressing?

  • Determine physical memory addresses
  • Specify the starting location of a memory segment
  • Add to the segment register value to generate the physical address (correct)
  • Store the memory addresses of instructions and data
  • If the data segment starts at location 1000h and a data reference contains the address 29h, what is the actual physical address of the data?

    <p>10029</p> Signup and view all the answers

    What does Segmented Memory Addressing use to specify a linear address?

    <p>Segment value added to offset value</p> Signup and view all the answers

    In Intel Memory Address Generation, what is the purpose of the segment register?

    <p>To specify the segment portion of the linear address</p> Signup and view all the answers

    What does Segmented Memory Addressing use to specify a linear address?

    <p>Segment register</p> Signup and view all the answers

    What is the role of the Code Segment in memory addressing?

    <p>It specifies the segment portion of the linear address</p> Signup and view all the answers

    Which segment register is responsible for storing the memory addresses of instructions and data?

    <p>Code Segment</p> Signup and view all the answers

    What role do Address registers play in memory addressing?

    <p>They store the memory addresses of instructions and data</p> Signup and view all the answers

    Study Notes

    • The text discusses the concept of segmentation in computer architecture, specifically in the context of the 8086 microprocessor.
    • Memory is divided into smaller parts called segments, which are: code segment, data segment, stack segment, and extra segment.
    • Each segment is identified by a unique 16-bit segment number.
    • Within a segment, specific memory locations are identified by a 16-bit offset.
    • Segment registers (CS, DS, SS, and ES) store these memory addresses for instructions and data.
    • Memory segmentation allows for more efficient use of memory by dividing it into manageable sections.
    • The Intel Microprocessor Unit (BIU) determines physical memory addresses by adding the segment register and the offset value.
    • A logical address is specified as a segment:offset combination, while the physical address is obtained by adding the segment register and the offset.
    • Each byte in memory is assigned a unique 20-bit address, creating a 1 megabyte addressable memory space.
    • The text highlights the problem of fitting 20-bit memory addresses into 16-bit registers, and solves it by discussing the method of memory segmentation.
    • In the example given, the data segment starts at location 1000h, and a reference to data located at address 29h is given. The actual data is located at the physical address obtained by adding the segment register and the offset.

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    Description

    Learn about segment registers and memory organization in computer architecture, including the challenge of fitting 20-bit addresses into 16-bit registers. Explore solutions such as memory segmentation to manage large memory addresses.

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