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AMD-K6 Datasheet(PDF) 212 Page - Advanced Micro Devices

Part # AMD-K6
Description  AMD-K6 Processor
PDF  346 Pages
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Manufacturer  AMD [Advanced Micro Devices]
Direct Link  http://www.amd.com
Logo AMD - Advanced Micro Devices

AMD-K6 Datasheet(HTML) 212 Page - Advanced Micro Devices

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194
System Management Mode (SMM)
Chapter 10
AMD-K6® Processor Data Sheet
20695H/0—March 1998
Preliminary Information
s
Far jumps or calls cannot transfer control to a segment with
a base address requiring more than 20 bits, as in Real mode
segment-base addressing
s
A20M# is masked
s
Interrupt vectors use the Real-mode interrupt vector table
s
The IF flag in EFLAGS is cleared (INTR not recognized)
s
The TF flag in EFLAGS is cleared
s
The NMI and INIT interrupts are disabled
s
Debug register DR7 is cleared (debug traps disabled)
Figure 72 on page 195 shows the default map of the SMM
me mo ry a rea . I t c o nsis ts o f a 64 -K by t e area, bet wee n
0003_0000h and 0003_FFFFh, of which the top 32 Kbytes
(0003_8000h to 0003_FFFFh) must be populated with RAM.
The default code-segment (CS) base address for the area —
called the SMM base address — is at 0003_0000h. The top 512
bytes (0003_FE00h to 0003_FFFFh) contain a fill-down SMM
state-save area. The default entry point for the SMM service
routine is 0003_8000h.



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