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ST486DX 数据表(PDF) 17 Page - STMicroelectronics

部件名 ST486DX
功能描述  PROGRAMMING MANUAL
PDF  34 Pages
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制造商  STMICROELECTRONICS [STMicroelectronics]
网页  http://www.st.com
标志 STMICROELECTRONICS - STMicroelectronics

ST486DX 数据表(HTML) 17 Page - STMicroelectronics

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Valid Cases
P
I
I/O Write
Data Size
I/O Write
Address
I/O Write
Data
ESI or
EDI
not an I/O ins.
x
x
x
x
x
x
IN
0
0
x
x
x
EDI
INS
0
0
x
x
x
EDI
REP INS
1
0
x
x
x
EDI
OUT al
0
1
01h
I/O Address
xxxxxxdd
ESI
OUT ax
0
1
03h
I/O Address
xxxxdddd
ESI
OUT eax
0
1
0Fh
I/O Address
dddddddd
ESI
OUTSB
0
1
01h
I/O Address
xxxxxxdd
ESI
OUTSW
0
1
03h
I/O Address
xxxxdddd
ESI
OUTSD
0
1
0Fh
I/O Address
dddddddd
ESI
REP OUTSB
1
1
01h
I/O Address
xxxxxxdd
ESI
REP OUTSW
1
1
03h
I/O Address
xxxxdddd
ESI
REP OUTSD
1
1
0Fh
I/O Address
dddddddd
ESI
Table 3 - 2
Valid I/O Trap Cases
x: invalid
CS
SMM base specified by SMAR, CS limit is set to 4 GBytes
EIP
0000 0000h;
Begins execution at the base of SMM memory
EFLAGS
0000 0002h;
Reset State
CR0
6000 0010h;
Real Mode, Cache in Write Through
DR7
0000 0400h;
Traps disabled
Table 3 - 3
SMM Entry State
ST486DX - SMM SOFTWARE CONSIDERATIONS
27
The values found in the I/O trap information fields are specified below for all cases.
Upon SMM entry, the CPU enters the following state:



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