AMD AMD-K6-2/400 User Guide - Page 54
Software Environment, floating-point registers. See Floating-Point Register Data - faults
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Preliminary Information AMD-K6™-2E+ Embedded Processor Data Sheet 23542A/0-September 2000 79 78 Sign The eight floating-point registers are physically 80 bits wide and labeled FPR0-FPR7. Figure 11 shows the format of the floating-point registers. See "Floating-Point Register Data Types" on page 34 for information on allowable floating-point data types. 64 63 0 Exponent Significand 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. 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 BC 3 TOSP CCC E S PUOZ D I 210SF EEEE EE Symbol B C3 TOSP C2 C1 C0 ES SF PE UE OE ZE DE IE Description Bits FPU Busy 15 Condition Code 14 Top of Stack Pointer 13-11 Condition Code 10 Condition Code 9 Condition Code 8 Error Summary Status 7 Stack Fault 6 Exception Flags Precision Error 5 Underflow Error 4 Overflow Error 3 Zero Divide Error 2 Denormalized Operation Error 1 Invalid Operation Error 0 TOSP Information 000 = FPR0 111 = FPR7 Figure 12. FPU Status Word Register 32 Software Environment Chapter 3