Filter Co-Processor
Operation Modes
MOTOROLA
DSP56305 User’s Manual
12-29
12.5.7
FCOP Mode 2: Full Complex FIR Filter
Mode 2 is selected when FOM[1:0] = 10. Each complex input consists of two filter
outputs: the first real, the second imaginary, generated alternately.
12.5.7.1
Mode 2 (Complex FIR Filter Generating Pure Real or Pure Imaginary
Outputs Alternately), No Decimation
The following equations are implemented:
Set Up
•
Load Filter Count Register (FCNT) with (number of coefficient
values – 1)
•
Choose operation mode (FOM[1:0], FDCM = 1, 0, 0) and enable
FCOP (FEN = 1)
DSP
Initialization
•
Core initializes coefficients in FCM in reverse order by executing
#filter_count writes to FCIR
•
Core or DMA initializes data in FDM in direct order by executing
#filter_count writes to FDIR
FR n
even
(
)
HR i
( )
DR n
i
–
(
)
⋅
(
)
HI i
( )
DI n
i
–
(
)
⋅
(
)
–
i
0
=
N
1
–
∑
=
FI n
odd
(
)
HR i
( )
DI n
i
–
(
)
⋅
(
)
HI i
( )
DR n
i
–
(
)
⋅
(
)
+
i
0
=
N
1
–
∑
=
Содержание DSP56305
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