NS32FX161-15 Datasheet, PDF (50/102 Pages) National Semiconductor (TI) – Advanced Imaging/Communication Signal Processors

3 0 Functional Description (Continued)
VARMAC Vector Aligned Real Multiply
and Accumulate
The VARMAC instruction performs a convolution sum of the
X and Y real vectors The previous value of the accumulator
is used and the result is stored in Z 0
Syntax
EXEC VARMAC
15
11 10
0
10000
100 0000 0000
Operation
aligned real X Y
real Z
real acc A
for (n40 n ^k LENG
n00)
A 4 A 0 X n low * Y n low 0
X n high * Y n high
Z 0 4 (real) A
Note When PARAM CLR is set to ‘‘1’’ A is cleared to ‘‘0’’ prior to the first
addition When PARAM SUB is set to ‘‘1’’ the ‘‘a’’ sign is replaced
by a ‘‘b’’ sign
VCMAC Vector Complex Multiply and Accumulate
The VCMAC instruction performs a convolution sum of the
X and Y complex vectors The previous value of the accu-
mulator is used and the result is stored in Z 0
Syntax
EXEC VCMAC
15
10000
Operation
11 10
0
100 0111 0101
complex X Y Z
complex acc A
for (n40 n ^k LENG n00)
A4A0Xn *Yn
Z 0 4 (complex) A
Note When PARAM COJ is set to ‘‘1’’ X n is multiplexed by the conjugate
of Y n When PARAM CLR is set to ‘‘1’’ A is cleared to ‘‘0’’ prior to
the first addition When PARAM SUB is set to ‘‘1’’ the ‘‘a’’ sign is
replaced by a ‘‘b’’ sign
VRLATP Vector Real Lattice Propagate
The VRLATP instruction is used for implementing lattice and
inverse lattice filter operations This instruction is used to
update the propagating values of vector Z
Syntax
EXEC VRLATP
15
10000
Operation
11 10
0
100 0010 1100
real X Y Z
real acc A
A 4 (real acc) Z 0
for (n41 n ^k LENG
n00)
A4A0Xn11 *Yn11
Z n 4 (real) A
A 4 (real acc) Z n
Note When PARAM SUB is set to ‘‘1’’ the ‘‘a’’ sign is replaced by a ‘‘b’’
sign The LENG parameter for this operation must be greater than 1
VCLATP Vector Complex Lattice Propagate
The VCLATP instruction is used for implementing lattice and
inverse lattice filter operations This instruction is used to
update the propagating values of vector Z
Syntax
EXEC VCLATP
15
10000
Operation
11 10
0
100 1110 1000
complex X Y Z
complex acc A
A 4 (complex acc) Z 0
for (n41 n ^k LENG n00)
A 4 A 0 X n11 * Y n11
Z n 4 (complex) A
Note When PARAM COJ is set to ‘‘1’’ X n is multiplied by the conjugate of
Y n When PARAM SUB is set to ‘‘1’’ the ‘‘a’’ sign is replaced by a
‘‘b’’ sign The LENG parameter for this operation must be greater
than 1
3 4 5 12 Multiply-and-Add Instructions
VAIMAD Vector Aligned Integer Multiply and Add
The VAIMAD instruction multiplies corresponding elements
of the X and Y integer vectors and adds or subtracts the
result as an integer value to the integer vector Z This re-
sult is placed in the Z output vector
Syntax
EXEC VAIMAD
15
11 10
0
10000
100 0001 0100
50