AMD AMD-K6-2/500AFX Data Sheet - Page 51
EFLAGS Register,
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21850J/0-February 2000 Preliminary Information AMD-K6®-2 Processor Data Sheet 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 20 shows the format of this register. 31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 VV I I I I AVR N O OD I T S Z A P C DP F CMF T P FFFFFF F F F L Reserved Symbol ID VIP VIF AC VM RF NT IOPL OF DF IF TF SF ZF AF PF CF Description Bits ID Flag 21 Virtual Interrupt Pending 20 Virtual Interrupt Flag 19 Alignment Check 18 Virtual-8086 Mode 17 Resume Flag 16 Nested Task 14 I/O Privilege Level 13-12 Overflow Flag 11 Direction Flag 10 Interrupt Flag 9 Trap Flag 8 Sign Flag 7 Zero Flag 6 Auxiliary Flag 4 Parity Flag 2 Carry Flag 0 Figure 20. EFLAGS Registers Chapter 3 Software Environment 31