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AMD-K6 데이터시트(PDF) 45 Page - Advanced Micro Devices

부품명 AMD-K6
상세설명  AMD-K6 Processor
PDF  346 Pages
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제조업체  AMD [Advanced Micro Devices]
홈페이지  http://www.amd.com
Logo AMD - Advanced Micro Devices

AMD-K6 데이터시트(HTML) 45 Page - Advanced Micro Devices

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Chapter 3
Software Environment
27
20695H/0—March 1998
AMD-K6® Processor Data Sheet
Preliminary Information
The FPU control word register allows a programmer to manage
the FPU processing options. Figure 12 shows the format of this
register.
Figure 12. FPU Control Word Register
The FPU tag word register contains information about the
registers in the register stack. Figure 13 shows the format of this
register.
Figure 13. FPU Tag Word Register
Symbol
Description
Bits
Y
Infinity Bit (80287 compatibility) 12
RC
Rounding Control
11–10
PC
Precision Control
9–8
Exception Masks
PM
Precision
5
UM
Underflow
4
OM
Overflow
3
ZM
Zero Divide
2
DM
Denormalized Operation
1
IM
Invalid Operation
0
9 8
7
654
3210
10
11
12
13
14
15
P
M
O
M
P
C
R
C
I
M
Z
M
U
M
D
M
Rounding Control Information
00b = Round to the nearest or even number
01b = Round down toward negative infinity
10b = Round up toward positive infinity
11b = Truncate toward zero
Reserved
Y
Precision Control Information
00b = 24 bits Single Precision Real
01b = Reserved
10b = 53 bits Double Precision Real
11b = 64 bits Extended Precision Real
9
8765
432
10
10
11
12
13
14
15
TAG
(FPR6
TAG
(FPR7
TAG
(FPR4
TAG
(FPR5
TAG
(FPR2
TAG
(FPR3
TAG
(FPR0
TAG
(FPR1
Tag Values
00 = Valid
01 = Zero
10 = Special
11 = Empty



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