Podcast
Questions and Answers
In the Intel Memory Address Generation, what is the purpose of the segment register?
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?
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?
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?
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?
What does Segmented Memory Addressing use to specify a linear address?
What does Segmented Memory Addressing use to specify a linear address?
In Intel Memory Address Generation, what is the purpose of the segment register?
In Intel Memory Address Generation, what is the purpose of the segment register?
What does Segmented Memory Addressing use to specify a linear address?
What does Segmented Memory Addressing use to specify a linear address?
What is the role of the Code Segment in memory addressing?
What is the role of the Code Segment in memory addressing?
Which segment register is responsible for storing the memory addresses of instructions and data?
Which segment register is responsible for storing the memory addresses of instructions and data?
What role do Address registers play in memory addressing?
What role do Address registers play in memory addressing?
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.
