Extended-Precision Real Format Summary - Motorola M68060 User Manual

Floating-Point Unit
Table 6-6. Extended-Precision Real Format Summary
Sign (s)
Biased Exponent (e)
Zero, Reserved (u)
Explicit Integer Bit (j)
Mantissa (f)
Total
Input
Output
Positive Mantissa
Negative Mantissa
Bias of Biased Exponent
Range of Biased Exponent
Explicit Integer Bit
Range of Mantissa
Mantissa (Explicit Integer Bit and Fraction)
Relation to Representation of Real Numbers
Biased Exponent Format Minimum
Bias of Biased Exponent
Explicit Integer Bit
Range of Mantissa
Mantissa (Explicit Integer Bit and Fraction)
Relation to Representation of Real Numbers
Biased Exponent Format Minimum
Mantissa (Explicit Integer Bit and Fraction)
Biased Exponent Format Maximum
Explicit Integer Bit
Mantissa (Explicit Integer Bit and Fraction)
Sign
Explicit Integer Bit
Biased Exponent Format Maximum
Mantissa
Representation of Mantissa
Nonsignaling
Signaling
Nonzero Bit Pattern Created by User
Mantissa When Created by FPU
6-10
Data Format
95 94 80 79 64 63 62
s
e u j
Field Size (in Bits)
Interpretation of Unused Bits
Interpretation of Sign
Normalized Numbers
Denormalized Numbers
Signed Zeros
Signed Infinities
NANs
M68060 USER'S MANUAL
0
f
1
15
16
1
63
96
Don't Care
All Zeros
s = 0
s = 1
+16383 ($3FFF)
0 < = e < 32767 ($7FFF)
1
Zero or Nonzero
1.f
(–1) s × 2 e–16383 × j.f
0 ($0000)
+16383 ($3FFF)
0
Nonzero
0.f
(–1) s × 2 –16383 × 0.f
0 ($0000)
0.0
32767 ($7FFF)
Don't Care
x.000...0000
Don't Care
Don't Care
32767 ($7FFF)
Nonzero
x.1xxxx...xxxx
x.0xxxx...xxxx
x.xxxxx...xxxx
1.11111...1111
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