NS32FX164AV-25 National Semiconductor, NS32FX164AV-25 Datasheet - Page 54

• Manufacturer Part Number: NS32FX164AV-25
• Description: IC IMAGING COMM SGNL PROC PLCC68
• Manufacturer: National Semiconductor

Specifications of NS32FX164AV-25

• Processor Type: Advanced Imaging/Communications Signal Processor SIAP™
• Speed: 50MHz
• Voltage: 5V
• Mounting Type: Surface Mount
• Package / Case: 68-PLCC
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Features: -
• Other names: *NS32FX164AV-25; Q1284286

3 0 Functional Description
Syntax
EXEC VCPOLY
Operation
X LENG 1
Note The LENG parameter for this operation must be greater than 1
VDECIDE Vector Nearest Neighbor Decision Logic
The VDECIDE instruction is used to implement nearest
neighbor decision in Quadrature Amplitude Modulation
(QAM) modem applications The input is the X complex vec-
tor The output is placed in the Z integer vector which can
be used as an index vector to extract information from look-
up tables The indicated constant values are taken from the
Y vector
Syntax
EXEC VDECIDE
Operation
(extended) Y 3
Y 3
Note Y INCR must be specified as 1 and Y WRAP must be specified as 3
15
15
complex X Z
real Y
complex temp
temp re
temp im
for (n 0
Z LENG
Y ADDR
complex X
aligned real Y
real Z
internal register complex temp
for (n 0
temp re
temp im
temp re
temp im
X n
Z n
((temp im * Y 2
Z n
high)
10000
10000
temp
(real) ((temp re * Y 2
re
re
(complex) Z n
(real) Y 0
0
n
Y 1
n
min (X n
min (X n
max (temp re
max (temp im
k
k
(real) (Z LENG
Y 0
low)
LENG
LENG
high)
11 10
11 10
* temp re)
l
re
im
n
n
* X 0
)
)
* X n 1
Y 0
Y 0
Y 1
Y 1
(extended)
101 0001 1000
100 1111 0000
re
re *
low)
high)
low)
high)
low)
(Continued)
temp
0
0
54
VDIST Vector Euclidean Distance
The VDIST instruction calculates the square of the Euclide-
an distance between corresponding elements of the X and
Y complex vectors and places the result in the Z real vec-
tor
Syntax
EXEC VDIST
Operation
VFFT Vector Fast Fourier Transform
The VFFT instruction implements one pass of in-place FFT
vector update according to the radix-2 FFT method
Syntax
EXEC VFFT
Operation
VESIIR Vector Extended Single-Pole IIR
This instruction is not supported by the NS32FX161
The VESIIR instruction performs a special form of an Infi-
nite-Impulse Response (IIR) filter The samples and coeffi-
cient are given as real values as well as the output result
However the accumulation is performed using extended-
precision arithmetic
Syntax
EXEC VESIIR
15
15
15
complex X Y
real Z
for (n 0
complex X Y Z
complex temp
for (n 0
Z n
temp
Y n
Z n
10000
10000
10000
(real) (X n
(complex) (Z n
(complex) (Z n
temp
n
n
k
k
LENG
LENG
(X n
11 10
11 10
11 10
n
n
re
im
)
)
100 1111 1110
101 0000 0110
101 0011 0111
Y n
Y n
X n
X n
re)** 2
im) **2
* Y n )
* Y n )
a
0
0
0