7-23
FLOATING-POINT UNIT
Figure 7-14. Real Mode FPU State Image in Memory, 32-BitFormat
Figure 7-15. Protected Mode FPU State Image in Memory, 16-BitFormat
0
31
0
4
8
12
16
20
24
32-Bit Real-Address Mode Format
Control Word
15
FPU Operand Pointer 31...16
FPU Instruction Pointer 31...16
Status Word
Tag Word
Opcode 10...00
0 0 0 0 0 0 0 0 0 0 0 0
FPU Operand Pointer 15...00
0 0 0 0
FPU Instruction Pointer 15...00
0 0 0 0
Reserved
0
Reserved
16
0
0
2
4
6
8
10
12
16-Bit Protected Mode Format
Control Word
15
Status Word
Tag Word
FPU Instruction Pointer Selector
FPU Operand Pointer Selector
FPU Operand Pointer Offset
FPU Instruction Pointer Offset
