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AMD-K6-2E/400AMZ Datasheet(PDF) 47 Page - Advanced Micro Devices

No. de pieza AMD-K6-2E/400AMZ
Descripción Electrónicos  AMD-K6??2E Embedded Processor
PDF  332 Pages
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Fabricante Electrónico  AMD [Advanced Micro Devices]
Página de inicio  http://www.amd.com
Logo AMD - Advanced Micro Devices

AMD-K6-2E/400AMZ Datasheet(HTML) 47 Page - Advanced Micro Devices

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Chapter 3
Software Environment
29
22529B/0—January 2000
AMD-K6™-2E Processor Data Sheet
Preliminary Information
The FPU control word register allows a programmer to manage
the FPU processing options. Figure 13 shows the format of the
FPU control word register.
Figure 13. FPU Control Word Register
The FPU tag word register contains information about the
registers in the register stack. Figure 14 shows the format of the
FPU tag word register.
Figure 14. FPU Tag Word Register
9 8
7
6543
210
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
Y
Precision Control Information
00b = 24 bits Single Precision Real
01b = Reserved
10b = 53 bits Double Precision Real
11b = 64 bits Extended Precision Real
Reserved
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
Tag Values
00 = Valid
01 = Zero
10 = Special
11 = Empty
87
65
4 3
2 1
0
10
11
12
13
14
15
TAG
(FPR7)
TAG
(FPR6)
TAG
(FPR4)
TAG
(FPR5)
TAG
(FPR2)
TAG
(FPR3)
TAG
(FPR0)
TAG
(FPR1)
9



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