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GXM 데이터시트(PDF) 206 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
부품명 GXM
상세설명  Geode??GXm Processor Integrated x86 Solution with MMX Support
PDF  244 Pages
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제조업체  NSC [National Semiconductor (TI)]
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GXM 데이터시트(HTML) 206 Page - National Semiconductor (TI)

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Revision 3.1
Instruction Set (Continued)
9.1.4
reg Field
The reg field (Table 9-10) determines which general regis-
ters are to be used. The selected register is dependent on
whether a 16- or 32-bit operation is current and on the sta-
tus of the w bit.
9.1.4.1
sreg2 Field (ES, CS, SS, DS Register
Selection)
The sreg2 field (Table 9-11) is a 2-bit field that allows one
of the four 286-type segment registers to be specified.
9.1.4.2
sreg3 Field (FS and GS Segment Register
Selection)
The sreg3 field (Table 9-12) is 3-bit field that is similar to
the sreg2 field, but allows use of the FS and GS segment
registers.
Table 9-10. General Registers Selected
by reg Field
reg
16-Bit Operation
32-Bit Operation
w = 0w = 1
w = 0w = 1
000
AL
AX
AL
EAX
001
CL
CX
CL
ECX
010
DL
DX
DL
EDX
011
BL
BX
BL
EBX
100
AH
SP
AH
ESP
101
CH
BP
CH
EBP
110
DH
SI
DH
ESI
111
BH
DI
BH
EDI
Table 9-11. sreg2 Field Encoding
sreg2 Field
Segment Register Selected
00
ES
01
CS
10
SS
11
DS
Table 9-12. sreg3 Field Encoding
sreg3 Field
Segment Register Selected
000
ES
001
CS
010
SS
011
DS
100
FS
101
GS
110
Undefined
111
Undefined



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