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MOTOROLA M68040 USER’S MANUAL 9- 45
Table 9-16. State Frame Field Information (Continued)
FSAVE State
Frame Field Contents
SNAN (For Opclass 011)
CMDREG1B FMOVE Instruction Command Word
ETEMP Unrounded Source Operand from Floating-Point Register, with SNAN bit set.
STAG Source Operand Tag, indicated NAN.
E1 Always 1
T Always 1
OPERR (For Opclass 000 and 010)
CMDREG1B Exception Instruction Command Word
ETEMP Source operand is converted to extended precision.
STAG Source Operand Tag
FPTEMP Destination operand, if any, is converted to extended precision.
DTAG Destination operand tag, if any.
E1 Always 1
T Always 0
OPERR (For Opclass 011)
CMDREG1B FMOVE Instruction Command Word
ETEMP Unrounded Source Operand from Floating-Point Register
STAG Source Operand Tag
WBTEMP Contains the rounded integer used to check for erroneous integer overflow.
E1 Always 1
T Always 1
OVFL (FMOVE to Register, FABS, and FNEG)
CMDREG1B Exception Instruction Command Word
FPTEMP Intermediate result with mantissa rounded to correct precision.
STAG Source Operand Tag = Normalized
E1 Always 1
T Always 0
OVFL (FADD, FSUB, FMUL, FDIV, and FSQRT)
CMDREG3B Encoded Exception Instruction Command Word
WBTEMP WBTS, WBTE, and WBTM equal the intermediate result with mantissa rounded
to the correct precision.
WBTE15 Bit 15 of the intermediate result's 16-bit exponent = 0 for overflow.
E3 Always 1
T Either 1 or 0
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