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Floating-Point Unit
6-10
M68060 USER’S MANUAL
MOTOROLA
Table 6-6. Extended-Precision Real Format Summary
Data Format
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
×
j.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
NANs
Sign Don’t Care
Explicit Integer Bit Don’t Care
Biased Exponent Format Maximum 32767 ($7FFF)
Mantissa Nonzero
Representation of Mantissa
Nonsignaling
Signaling
Nonzero Bit Pattern Created by User
Mantissa When Created by FPU
x.1xxxx…xxxx
x.0xxxx…xxxx
x.xxxxx…xxxx
1.11111…1111
sef
95 94 80 79 64
u
62 0
j
63
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