Double-Precision Real Format Summary - Motorola M68060 User Manual

Table 6-5. Double-Precision Real Format Summary
Sign (s)
Biased Exponent (e)
Fraction (f)
Total
Positive Fraction
Negative Fraction
Bias of Biased Exponent
Range of Biased Exponent
Range of Fraction
Fraction
Relation to Representation of Real Numbers
Biased Exponent Format Minimum
Bias of Biased Exponent
Range of Fraction
Fraction
Relation to Representation of Real Numbers
Biased Exponent Format Minimum
Fraction (Mantissa/Significand)
Biased Exponent Format Maximum
Fraction
Sign
Biased Exponent Format Maximum
Fraction
Representation of Fraction
Nonsignaling
Signaling
Nonzero Bit Pattern Created by User
Fraction When Created by FPU
Maximum Positive Normalized
Minimum Positive Normalized
Minimum Positive Denormalized
MOTOROLA
Data Format
63 62 52 51
s
e f
Field Size (in Bits)
Interpretation of Sign
Normalized Numbers
Denormalized Numbers
Signed Zeros
Signed Infinities
NANs
Approximate Ranges
M68060 USER'S MANUAL
Floating-Point Unit
0
1
11
52
64
s = 0
s = 1
+1023 ($3FF)
0 < e < 2047 ($7FF)
Zero or Nonzero
1.f
(–1) s × 2 e–1023 × 1.f
0 ($000)
+1022 ($3FE)
Nonzero
0.f
(–1) s × 2 –1022 × 0.f
0 ($00)
0.f = 0.0
2047 ($7FF)
0.f = 0.0
0 or 1
2047 ($7FF)
Nonzero
.1xxxx...xxxx
.0xxxx...xxxx
.xxxxx...xxxx
.11111...1111
1.8 x 10 308
2.2 x 10 –308
4.9 x 10 –324
6-9