N386SX Просмотр технического описания (PDF) - Intel
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N386SX Datasheet PDF : 47 Pages
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Intel387TM SX MATH COPROCESSOR
Instruction
DATA TRANSFER
FLD e Loada
Integer real memory to ST(0)
Long integer memory to ST(0)
Extended real memory to ST(0)
BCD memory to ST(0)
ST(i) to ST(0)
FST e Store
ST(0) to integer real memory
ST(0) to ST(i)
FSTP e Store and Pop
ST(0) to integer real memory
ST(0) to long integer memory
ST(0) to extended real memory
ST(0) to BCD memory
ST(0) to ST(i)
FXCH e Exchange
ST(i) and ST(0)
Byte 0
Encoding
Byte 1
Optional
Bytes 2 – 6
ESC MF 1
ESC 111
ESC 011
ESC 111
ESC 001
MOD 000 R M
MOD 101 R M
MOD 101 R M
MOD 100 R M
11000 ST(i)
SIB DISP
SIB DISP
SIB DISP
SIB DISP
ESC MF 1
ESC 101
MOD 010 R M
11010 ST(i)
SIB DISP
ESC MF 1
ESC 111
ESC 011
ESC 111
ESC 101
MOD 011 R M
MOD 111 R M
MOD 111 R M
MOD 110 R M
11011 ST (i)
SIB DISP
SIB DISP
SIB DISP
SIB DISP
ESC 001
11001 ST(i)
COMPARISON
FCOM e Compare
Integer real memory to ST(0)
ESC MF 0
MOD 010 R M
SIB DISP
ST(i) to ST(0)
ESC 000
11010 ST(i)
FCOMP e Compare and pop
Integer real memory to ST(0)
ESC MF 0
MOD 011 R M
SIB DISP
ST(i) to ST(0)
ESC 000
11011 ST(i)
FCOMPP e Compare and pop twice
ST(1) to ST(0)
ESC 110
1101 1001
FTST e Test ST(0)
ESC 001
1110 0100
FUCOM e Unordered compare
ESC 101
11100 ST(i)
FUCOMP e Unordered compare
and pop
ESC 101
11101 ST(i)
FUCOMPP e Unordered compare
and pop twice
ESC 010
1110 1001
FXAM e Examine ST(0)
ESC 001
1110 0101
Shaded areas indicate instructions not available in 8087 80287
NOTE
a When loading single or double precision zero from memory add 5 clocks
32-Bit
Real
Clock Count Range
32-Bit 64-Bit
Integer Real
16-Bit
Integer
11 – 20
28 – 44 20 – 27
30 – 58
16 – 47
49 – 101
7 – 12
42 – 53
27 – 45
59 – 78
59
7 – 11
58 – 76
27 – 45
59 – 78
59
64 – 86
50 – 56
116 – 194
7 – 11
58 – 76
10 – 17
15 – 27
36 – 54 18 – 31
13 – 21
39 – 62
15 – 27
36 – 54 18 – 31
13 – 21
39 – 62
13 – 21
17 – 25
13 – 21
13 – 21
13 – 21
24-37
42
42
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