AMD-K6-2E/400AFR AMD [Advanced Micro Devices], AMD-K6-2E/400AFR Datasheet - Page 52

• Manufacturer Part Number: AMD-K6-2E/400AFR
• Manufacturer: AMD [Advanced Micro Devices]

AMD-K6™-2E Processor Data Sheet
EFLAGS Register
Figure 20. EFLAGS Register
34
Symbol
ID
VIP
VIF
AC
VM
RF
NT
IOPL
OF
DF
IF
TF
SF
ZF
AF
PF
CF
31 30 29 28 27 26 25 24 23 22
Reserved
ID Flag
Virtual Interrupt Pending
Virtual Interrupt Flag
Alignment Check
Virtual-8086 Mode
Resume Flag
Nested Task
I/O Privilege Level
Overflow Flag
Direction Flag
Interrupt Flag
Trap Flag
Sign Flag
Zero Flag
Auxiliary Flag
Parity Flag
Carry Flag
Description
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 20 shows the format of the EFLAGS register.
13–12
Bits
21
20
19
18
17
16
14
11
10
9
8
7
6
4
2
0
21
D
I
20
Preliminary Information
V
P
I
19
Software Environment
V
F
I
18
A
C
17
M
V
16
R
F
15
14
N
T
13
O
P
L
I
12
11
O
F
10
D
F
9
F
I
8
T
F
7
S
F
6
Z
F
5
4
A
22529B/0—January 2000
F
3
2
P
F
1
Chapter 3
C
0
F