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AMD-K6-2E/233AMZ 데이터시트(PDF) 46 Page - Advanced Micro Devices |
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AMD-K6-2E/233AMZ 데이터시트(HTML) 46 Page - Advanced Micro Devices |
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46 / 332 page ![]() 28 Software Environment Chapter 3 AMD-K6™-2E Processor Data Sheet 22529B/0—January 2000 Preliminary Information The eight floating-point registers are physically 80 bits wide and labeled FPR0–FPR7. Figure 11 shows the format of these floating-point registers. See “Floating-Point Register Data Types” on page 30 for information on allowable floating-point data types. Figure 11. Floating-Point Register The 16-bit FPU status word register contains information about the state of the floating-point unit. Figure 12 shows the format of the FPU status word register. Figure 12. FPU Status Word Register 64 63 0 78 79 Sign Exponent Significand 9 8 7 654 3210 10 11 12 13 14 15 P E O E E S C 0 C 1 I E Z E U E S F TOSP C 3 B C 2 D E Symbol Description Bits BFPU Busy 15 C3 Condition Code 14 TOSP Top of Stack Pointer 13–11 C2 Condition Code 10 C1 Condition Code 9 C0 Condition Code 8 ES Error Summary Status 7 SF Stack Fault 6 Exception Flags PE Precision Error 5 UE Underflow Error 4 OE Overflow Error 3 ZE Zero Divide Error 2 DE Denormalized Operation Error 1 IE Invalid Operation Error 0 TOSP Information 000 = FPR0 111 = FPR7 |
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