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AMD-K6 Datasheet(PDF) 49 Page - Advanced Micro Devices

Part # AMD-K6
Description  AMD-K6 Processor
PDF  346 Pages
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Manufacturer  AMD [Advanced Micro Devices]
Direct Link  http://www.amd.com
Logo AMD - Advanced Micro Devices

AMD-K6 Datasheet(HTML) 49 Page - Advanced Micro Devices

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Chapter 3
Software Environment
31
20695H/0—March 1998
AMD-K6® Processor Data Sheet
Preliminary Information
EFLAGS Register
The EFLAGS register provides for three different types of
flags — system, control, and status. The system flags provide
operating system controls, the control flag provides directional
information for string operations, and the status flags provide
information resulting from logical and arithmetic operations.
Figure 18 shows the format of this register.
Figure 18. EFLAGS Registers
98
7654
321
0
10
11
12
13
14
15
16
17
18
19
20
21
I
O
P
L
31 30 29 28 27 26 25 24 23 22
A
F
P
F
Z
F
S
F
I
F
D
F
T
F
O
F
N
T
R
F
V
M
A
C
V
I
F
V
I
P
I
D
C
F
Reserved
Symbol
Description
Bits
ID
ID Flag
21
VIP
Virtual Interrupt Pending
20
VIF
Virtual Interrupt Flag
19
AC
Alignment Check
18
VM
Virtual-8086 Mode
17
RF
Resume Flag
16
NT
Nested Task
14
IOPL
I/O Privilege Level
13–12
OF
Overflow Flag
11
DF
Direction Flag
10
IF
Interrupt Flag
9
TF
Trap Flag
8
SF
Sign Flag
7
ZF
Zero Flag
6
AF
Auxiliary Flag
4
PF
Parity Flag
2
CF
Carry Flag
0



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