Motorola MPC823e Reference Manual page 508

Communication Processor Module
16.3.4.5 FIR6–COMPLEX C, REAL X, AND COMPLEX Y. The FIR6 function implements
a basic FIR filter with k complex coefficients, real input samples, and complex output. The
input data is in a circular buffer with size M+1 and the output data is in a circular buffer with
size N+1.
X(N)
{REAL}
16.3.4.5.1 Coefficients and Sample Data Buffers. The coefficients vector occupies k
pairs of 16-bit half-words (real and imaginary components) in memory and C(0) is stored in
the first location. The sample input buffer is a cyclic buffer containing M+1 bytes and each
sample is a 16-bit half-word. The new sample is stored in the address that follows the
previous sample. The output buffer is a cyclic buffer that contains N+1 bytes and the new
output is stored in the address that follows the previous output.
16-54
C(0)
{COMPLEX}
T
C(1)
T
C(2)
T
C(K-1)
Figure 16-20. FIR6 Implementation Example
MPC823e REFERENCE MANUAL
∑
Y(N)
{COMPLEX}
k 1
∑
Y n ( )
=
p
–
C p ( )X n p ( )
–
= 0
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