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Motorola DSP96002 User Manual

Page 60

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MOTOROLA

DSP96002 USER’S MANUAL

5 - 7

e = Biased Exponent .... 11

u = U tag .............. 1
v = V tag .............. 1
i = Integer Part ....... 1
f = Fraction ........... 52
z = Unused bits......... 29

Interpretation of Unused Bits:

Input .................. Don’t Care
Output.................. All Zeros

Unused bits should be written with zero for future compatibility.

Interpretation of Sign:

Positive Mantissa: s = 0
Negative Mantissa: s = 1

Normalized Numbers:

Represents real numbers in the form (-1)

s

x 2

(e-1023)

x 1.f

Bias of e .............. +1023 ($3FF)
e ...................... 0 < e < 2047 ($7FF)
i ...................... 1
f ...................... Zero or Non-Zero
Mantissa................ i.f = 1.f

Denormalized Numbers:

Represents real numbers in the form (-1)

s

x 2

(-1022)

x 0.f

Bias of e .............. +1022 ($3FE)
e ...................... 0 ($000)
i ...................... 0
f ...................... Non-Zero
Mantissa................ i.f = 0.f

Signed Zeros:

Bias of e .............. n.a.

e ...................... 0 ($000)
i ...................... 0
f ...................... Zero
Mantissa................ i.f = 0.00...00

Signed Infinities:

Bias of e .............. n.a.
e ...................... 2047 ($7FF)
i ...................... 1
f ...................... Zero

S

Biased

Exponent

63 62

0

Zero

Zero

I

U

V

95 94 93 92

75 74

64

11 10

Fraction