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9- 10 M68040 USER’S MANUAL MOTOROLA
Table 9-5. Extended-Precision Real Format Summary
Data Format
sef
95 94 80 79 64
u
62 0
j
63
Field Size (in Bits)
Sign (s) 1
Biased Exponent (e) 15
Zero, Reserved (u) 16
Explicit Integer Bit (j) 1
Mantissa (f) 63
Total 96
Interpretation of Unused Bits
Input Don’t Care
Output All Zeros
Interpretation of Sign
Positive Mantissa s = 0
Negative Mantissa s = 1
Normalized Numbers
Bias of Biased Exponent +16383 ($3FFF)
Range of Biased Exponent 0 < = e < 32767 ($7FFF)
Explicit Integer Bit 1
Range of Mantissa Zero or Nonzero
Mantissa (Explicit Integer Bit and Fraction ) 1.f
Relation to Representation of Real Numbers (–1) s × 2e–16383 × 1.f
Denormalized Numbers
Biased Exponent Format Minimum 0 ($0000)
Bias of Biased Exponent +16383 ($3FFF)
Explicit Integer Bit 0
Range of Mantissa Nonzero
Mantissa (Explicit Integer Bit and Fraction ) 0.f
Relation to Representation of Real Numbers (–1) s × 2 –16383 × 0.f
Signed Zeros
Biased Exponent Format Minimum 0 ($0000)
Mantissa (Explicit Integer Bit and Fraction ) 0.0
Signed Infinities
Biased Exponent Format Maximum 32767 ($7FFF)
Explicit Integer Bit Don’t Care
Mantissa (Explicit Integer Bit and Fraction ) x.000…0000
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