mpc823rg Freescale Semiconductor, Inc, mpc823rg Datasheet - Page 494

• Manufacturer Part Number: mpc823rg
• Description: Mpc823 Powerquicc Integrated Communications Processor For Portable Systems
• Manufacturer: Freescale Semiconductor, Inc

Communication Processor Module
16.3.4.2 FIR2–REAL C, COMPLEX X, AND COMPLEX Y. The FIR2 function implements
a basic FIR filter with k real coefficients, complex 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.
16.3.4.2.1 Coefficients and Sample Data Buffers. The coefficients vector occupies k
16-bit half-words in memory and C(0) is stored in the first location. The sample input buffer
is a cyclic buffer that contains M+1 bytes and each input sample is two 16-bit half-words (real
and imaginary components). The new sample is stored in the address that follows the
previous sample. The output buffer is a cyclic buffer containing N+1 bytes. Each output is
two 16-bit half-words (real and imaginary components). The new output is stored in the
address that follows the previous output.
{COMPLEX}
X(N)
Figure 16-14. FIR2 Implementation Example
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{REAL}
C(K-1)
C(0)
C(1)
C(2)
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{COMPLEX}
Y n
Y(N)
=
p
k 1
–
=
0
C p X n p
–
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