NS32FX161-15 Datasheet, PDF (55/102 Pages) National Semiconductor (TI) – Advanced Imaging/Communication Signal Processors

3 0 Functional Description (Continued)
Operation
real X Y Z
real acc A
for (n40 n ^k LENG n00)
A 4 (real acc) ((extended)A)
A 4 (real acc) (A * X n )) 0 Y n02
Z n 4 (real) A
Note The term (A X n ) is a 32-bit by 16-bit multiplication During the
conversion of this product to a real accumulator data type rounding
is done if PARAM RND is ‘‘1’’ During the conversion of A to a real
data type the result is rounded if Y 0 e 0x0080 or truncated if Y 0
e 0x0 The result with other values of Y 0 are unpredictable Y 1
must be specified as 0x7fff
3 5 SYSTEM INTERFACE
This section provides general information on the
NS32FX164 interface to the external world Descriptions of
the CPU requirements as well as the various bus character-
istics are provided here Details on other device characteris-
tics including timing are given in Sections 4 2 – 4 4 2
3 5 1 Power and Grounding
The NS32FX164 requires a single 5V power supply applied
on the V_CC pins These pins should be connected together
by a power (V_CC) plane on the printed circuit board
The grounding connections are made on the GND pins
These pins should be connected together by a ground
(GND) plane on the printed circuit board
Both power and ground connections are shown in Figure
3-14
FIGURE 3-13 DSP Module Block Diagram
TL EE 11267 – 25
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