Enhanced Filter Coprocessor
10.3.3 FIR Filter Type
To select the FIR filter type clear FCSR[FLT] and perform the processing shown in Figure 10-4
based on the equation shown below. The EFCOP takes an input, x(n) , from the FDIR, saves the
N
w ( n ) =
∑ B i x ( n – i )
i = 0
input while shifting the previous inputs down in the FDM, multiplies each input in the FDM by
the corresponding coefficient, B i , stored in the FCM, accumulates the multiplication results, and
places accumulation result, w(n) , in the FDOR. This is done for each sample input to the FDIR.
FDM
FCM
FDIR
x(n)
x(n – 1)
x(n – 2)
x(n – N)
B 0
B 1
B 2
B N
FDOR
Figure 10-4. FIR Filter Type Processing
10.3.3.1 FIR Operating Modes
There are four operating modes available with the FIR filter type:
Real
Complex
Alternating complex
Magnitude mode.
10.3.3.1.1 Real Mode
Real mode performs FIR type filtering with real data and is selected by clearing both FOM bits in
the FCSR. One sample, the real input, is written to the FDIR, and the EFCOP processes the data.
Then one sample, the real output, is read from the FDOR. Four options are available with the real
FIR filter type: coefficient update, adaptive mode, multichannel mode, and decimation. The first
DSP56311 Reference Manual, Rev. 2
10-8
Freescale Semiconductor
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