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GXM 数据表(PDF) 205 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
部件名 GXM
功能描述  Geode??GXm Processor Integrated x86 Solution with MMX Support
PDF  244 Pages
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制造商  NSC [National Semiconductor (TI)]
网页  http://www.national.com
标志 NSC - National Semiconductor (TI)

GXM 数据表(HTML) 205 Page - National Semiconductor (TI)

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Instruction Set (Continued)
9.1.3
mod and r/m Byte (Memory Addressing)
Themod andr/m fields within themod r/mbyte, select the
type of memory addressing to be used. Some instructions
use a fixed addressing mode (e.g., PUSH or POP) and
therefore, these fields are not present. Table 9-8 lists the
addressing method when 16-bit addressing is used and a
mod r/m byte is present. Some mod r/m field encodings
are dependent on the w field and are shown in Table 9-8.
Table 9-8. General Registers Selected by mod
r/m Fields and w Field
mod
r/m
16-Bit
Operation
32-Bit
Operation
w = 0w = 1
w = 0w = 1
11
000
AL
AX
AL
EAX
11
001
CL
CX
CL
ECX
11
010
DL
DX
DL
EDX
11
011
BL
BX
BL
EBX
11
100
AH
SP
AH
ESP
11
101
CH
BP
CH
EBP
11
110
DH
SI
DH
ESI
11
111
BH
DI
BH
EDI
Table 9-9. mod r/m Field Encoding
mod
Field
r/m
Field
16-Bit Address
Mode with
mod r/m Byte
32-Bit Address
Mode with mod r/m
Byte and No s-i-b
Byte Present
00
000
DS:[BX+SI]
DS:[EAX]
00
001
DS:[BX+DI]
DS:[ECX]
00
010
SS:[BP+SI]
DS:[EDX]
00
011
SS:[BP+DI]
DS:[EBX]
00
100
DS:[SI]
s-i-b is present
(See Table 9-15)
00
101
DS:[DI]
DS:[d32]
00
110
DS:[d16]
DS:[ESI]
00
111
DS:[BX]
DS:[EDI]
01
000
DS:[BX+SI+d8]
DS:[EAX+d8]
01
001
DS:[BX+DI+d8]
DS:[ECX+d8]
01
010
SS:[BP+SI+d8]
DS:[EDX+d8]
01
011
SS:[BP+DI+d8]
DS:[EBX+d8]
01
100
DS:[SI+d8]
s-i-b is present
(See Table 9-15)
01
101
DS:[DI+d8]
SS:[EBP+d8]
01
110
SS:[BP+d8]
DS:[ESI+d8]
01
111
DS:[BX+d8]
DS:[EDI+d8]
10
000
DS:[BX+SI+d16]
DS:[EAX+d32]
10
001
DS:[BX+DI+d16]
DS:[ECX+d32]
10
010
SS:[BP+SI+d16]
DS:[EDX+d32]
10
011
SS:[BP+DI+d16]
DS:[EBX+d32]
10
100
DS:[SI+d16]
s-i-b is present
(See Table 9-15)
10
101
DS:[DI+d16]
SS:[EBP+d32]
10
110
SS:[BP+d16]
DS:[ESI+d32]
10
111
DS:[BX+d16]
DS:[EDI+d32]
11
xxx
See Table 9-8.
See Table 9-8
Note: Note: d8 refers to 8-bit displacement, and d16 refers to
16-bit displacement.



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