80C187 데이터 시트보기 (PDF) - Intel

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80C187

80-BIT MATH COPROCESSOR

Intel 

80C187

270640 – 4

Precision Control

Rounding Control

00 24 Bits (Single Precision)

00 Round to Nearest or Even

01 (Reserved)

01 Round Down (toward b %)

10 53 Bits (Double Precision)

10 Round Up (toward a %)

11 64 Bits (Extended Precision)

11 Chop (Truncate toward Zero)

The ‘‘infinity control’’ bit is not meaningful to the 80C187 To maintain compatibility with the 8087 this bit can be

programmed however regardless of its value the 80C187 treats infinity in the affine sense (b% k a %)

Figure 5 Control Word

15

IP19 16

OP19 16

7

0

CONTROL WORD

a0

STATUS WORD

a2

TAG WORD

a4

INSTRUCTION POINTER15 0

a6

0

OPCODE10 0

a8

OPERAND POINTER15 0

aA

0 0 0 0 0 0 0 0 0 0 0 0 aC

Figure 6 Instruction and Data Pointer Image in Memory

10

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