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AMD-K6-2E/400AMZ Datasheet(PDF) 44 Page - Advanced Micro Devices

No. de pieza AMD-K6-2E/400AMZ
Descripción Electrónicos  AMD-K6??2E Embedded Processor
PDF  332 Pages
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Fabricante Electrónico  AMD [Advanced Micro Devices]
Página de inicio  http://www.amd.com
Logo AMD - Advanced Micro Devices

AMD-K6-2E/400AMZ Datasheet(HTML) 44 Page - Advanced Micro Devices

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26
Software Environment
Chapter 3
AMD-K6™-2E Processor Data Sheet
22529B/0—January 2000
Preliminary Information
Segment Registers
The six 16-bit segment registers are used as pointers to areas
(segments) of memory. Table 4 lists the segment registers and
their functions. Figure 9 shows the format for all six segment
registers.
Figure 9. Segment Register
Segment Usage
The operating system determines the type of memory model
that is implemented. The segment register usage is determined
by the operating system’s memory model. In a real mode
memory model, the segment register points to the base address
in memory.
In a protected mode memory model, the segment register is
called a selector and it selects a segment descriptor in a
descriptor table. This descriptor contains a pointer to the base
of the segment, the limit of the segment, and various protection
attributes. For more information on descriptor formats, see
“Descriptors and Gates” on page 52. Figure 10 on page 27 shows
segment usage for real mode and protected mode memory
models.
Table 4. Segment Registers
Segment
Register
Segment Register Function
CS
Code segment, where instructions are located
DS
Data segment, where data is located
ES
Data segment, where data is located
FS
Data segment, where data is located
GS
Data segment, where data is located
SS
Stack segment
0
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