N386SX 데이터 시트보기 (PDF) - Intel
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N386SX Datasheet PDF : 47 Pages
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Intel387TM SX MATH COPROCESSOR
Instruction
ARITHMETIC
FADD e Add
Integer real memory to ST(0)
ST(i) and ST(0)
FSUB e Subtract
Integer real memory with ST(0)
ST(i) to ST(0)
FMUL e Multiply
Integer real memory with ST(0)
ST(i) and ST(0)
FDIV e Divide
Integer real memory with ST(0)
ST(i) and ST(0)
FSQRT i e Square root
FSCALE e Scale ST(0) by ST(1)
FPREM e Partial remainder
FPREM1 e Partial remainder (IEEE)
FRNDINT e Round ST(0) to integer
FXTRACT e Extract components
of ST(0)
FABS e Absolute value of ST(0)
FCHS e Change sign of ST(0)
Byte 0
Encoding
Byte 1
Optional
Bytes 2 – 6
32-Bit
Real
Clock Count Range
32-Bit
Integer
64-Bit
Real
16-Bit
Integer
ESC MF 0
ESC d P 0
MOD 000 R M
11000 ST(i)
SIB DISP
SIB DISP
14 – 31
36 – 58 19 – 38
12 – 26b
38 – 64
ESC MF 0
ESC d P 0
MOD 10 R R M
1110 R R M
SIB DISP
14 – 31
36 – 58 19 – 38
12 – 26d
38 – 64c
ESC MF 0
ESC d P 0
MOD 001 R M
1100 1 R M
SIB DISP
21 – 33
45 – 73 27 – 57
17 – 50e
46 – 74
ESC MF 0
ESC d P 0
ESC 001
ESC 001
ESC 001
ESC 001
ESC 001
MOD 11 R R M
1111 R R M
1111 1010
1111 1101
1111 1000
1111 0101
1111 1100
SIB DISP
ESC 001
ESC 001
ESC 001
1111 0100
1110 0001
1110 0000
79 – 87
103 – 116f 85 – 95
77 – 80h
97 – 111
44 – 82
56 – 140
81 – 168
105 – 124g
41 – 62
42 – 63
14 – 21
17 – 24
TRANSCENDENTAL
FCOSk e Cosine of ST(0)
FPTANk e Partial tangent of ST(0)
ESC 001
ESC 001
1111 1111
1111 0010
122 – 680
162 – 430j
FPATAN e Partial arctangent of ST(0)
ESC 001
1111 0011
FSINk e Sine of ST(0)
ESC 001
1111 1110
FSINCOSk e Sine and cosine of ST(0)
ESC 001
1111 1011
F2XM1l e 2ST(0) b 1
ESC 001
1111 0000
FYL2Xm e ST(1) log2ST(0)
ESC 001
1111 0001
FYL2XP1n e ST(1) log2 ST(0) a 1 0
ESC 001
1111 1001
Shaded areas indicate instructions not available in 8087 80287
250 – 420
121 – 680
150 – 650
167 – 410
99 – 436
210 – 447
NOTES
b Add 3 clocks to the range when d e 1
c Add 1 clock to each range when R e 1
d Add 3 clocks to the range when d e 0
e typical e 52 (When d e 0 46 – 54 typical e 49)
f Add 1 clock to the range when R e 1
g 135 – 141 when R e 1
h Add 3 clocks to the range when d e 1
i b0 s ST(0) s a %
l l j These timings hold for operands in the range x k q For operands not in this range up to 76 additional clocks may be
needed to reduce the operand
k 0 s ST(0) k 263
l b1 0 s ST(0) s 1 0
m 0 s ST(0) k % b% k ST(1) k a %
l l n 0 s ST(0) k 2-SQRT(2) 2 b% kST(1) k a %
43
43
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