N386SX データシートの表示（PDF） - Intel
部品番号
コンポーネント説明
メーカー
N386SX Datasheet PDF : 47 Pages
| |||
Intel387TM SX MATH COPROCESSOR
3 1 6 PROCESSOR INSTRUCTIONS
(ADMINISTRATIVE)
FINIT
Initialize Math CoProcessor
FLDCW Load Control Word
FSTCW Store Control Word
FLDCW Load Status Word
FSTSW Store Status Word
FSTSW AX Store Status Word to AX register
FCLEX Clear Exceptions
FSTENV Store Environment
FLDENV Load Environment
FSAVE Save State
FRSTOR Restore State
FINCSTP Increment Stack pointer
FDECSTP Decrement Stack pointer
FFREE Free Register
FNOP
No Operation
FWAIT Report Math CoProcessor Error
3 2 Register Set
Figure 3-1 shows the Intel387 SX Math CoProcessor
register set When a Math CoProcessor is present in
a system programmers may use these registers in
addition to the registers normally available on the
CPU
i386TM Microprocessor Registers
GENERAL REGISTERS
31
16 15
0
EAX
AX
AH AL
EBX
BX
BH BL
ECX
CX
CH CL
EDX
DX
DH DL
SEGMENT REGISTERS
15
0
CS
SS
DS
ES
FS
GS
ESI
SI
31
0
EDI
DI
EIP
EBP
BP
EFLAGS
ESP
SP
l
l i387TM Math CoProcessor Data Registers
l
l
l
79 78 64 63
0
l
l R0 Sign Exponent
Significand
Tag
Field
10
l R1
l
l
R2
l R3
l R4
l
l
R5
l R6
l R7
l
l
l 15
0
l
Control Register
l
Status Register
l
l
Tag Word
l
l
47
0
l
l
Instruction Pointer (in CPU)
l
Data Pointer (in CPU)
l
l
l
Figure 3-1 Intel386TM CPU and Intel387TM Math CoProcessor Register Set
11
11
Share Link: 