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Control and
Arbitration Unit
1. Round to nearest (even): a convergent rounding mode, designed to deliver results without a
rounding bias. In this case the infinite-precision result is rounded to the finite-precision result
which is closest. In the case of an absolute tie, the infinite-precision result is rounded to the
"nearest even" finite precision result, as is illustrated in Table D-2.
2. finite precision result which is closest to zero. Clearly, results are rounded up in this mode when
negative, and down when positive.
3. Round to plus infinity: results are always rounded in the direction of plus infinity, i.e. "up".
MOTOROLA
Automatic Format Conversion Unit
d0.h
d 0.m
Operands
Add/Subtract Unit
Multiply Unit
Special Function Unit
Figure D-8. The Data ALU
DSP96002 USER'S MANUAL
X-Data Bus
Y-Data Bus
d0
d0.l
d1
d2
d3
d4
Register File
d5
d6
d7
d8
d9
Results
D-9
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