Motorola DSP96002 - Manual (Page 57)

5 - 4 DSP96002 USER’S MANUAL MOTOROLA
Denormalized Numbers:
Represents real numbers in the form (-1)
s
x 2
(E
min
-1+127)
x 0.f
Bias of e .............. +127 ($7E)
e ...................... 0 ($00)
f....................... Non-Zero
Mantissa................ 0.f
Signed Zeros:
Represents real zeroes in the form (-1)
s
x 2
(E
min
-1+127)
x 0.0
Bias of e .............. +127 ($7F)
e ...................... 0 ($00)
f....................... Zero
Mantissa................ 0.f = 0.00...00
Signed Infinities:
Represents real infinities in the form (-1)
s
x 2
(E
max
+1+127)
x 1.0
Bias of e .............. +127 ($7F)
e ...................... 255 ($FF)
f....................... Zero
Mantissa .......... 1.f+1.00...00
NaNs (Not-a-Number):
Represents NaNs as 2
(E
max
+1+127)
x 1. f
s ...................... Don’t care
Bias of e .............. n.a.
e ...................... 255($FF)
f ...................... Non-Zero: 11...11 Internal (legal) QNaN
1x...xx recognized QNaN
0x...xx SNaN
5.2.2.2 Double Precision Real Memory Format Summary
Fraction
S
Biased
Exponent
63 62 52 51 0
63 0
Field Size (in bits):
s = Sign ............... 1
e = Biased Exponent .... 11
f = Fraction ........... 52
Interpretation of Sign:
Positive Mantissa: s = 0
Negative Mantissa: s = 1