Altera FIR Compiler II MegaCore Function - Manual (Page 28)

Parameter Value Description
Back Pressure
Support
— Turn on this option to enable backpressure
support. When this option is turned on, the sink
signals the source to stop the flow of data when its
FIFO buffers are full or when there is congestion
on its output port.
Coefficient Parameters
Table 3-2: Filter Specification Parameters
Parameter Value Description
Coefficient Options
L-th Band Filter
All taps
Half band
3rd–5th Specifies the appropriate L-band Nyquist filters.
Every Lth coefficient of these filters is zero,
counting out from the center tap.
Coefficient Scaling Auto
None Specifies the coefficient scaling mode. Select Auto
to apply a scaling factor in which the maximum
coefficient value equals the maximum possible
value for a given number of bits. Select None to
read in pre-scaled integer values for the
coefficients and disable scaling.
Coefficient Data
Type
Signed Binary
Signed Fractional Binary Specifies the coefficient input data type. Select
Signed Fractional Binary to monitor which bits
are preserved and which bits are removed during
the filtering process.
Coefficient Bit
Width
2–32 Specifies the width of the coefficients. The default
value is 8 bits.
Coefficient
Fractional Bit Width
0–32 Specifies the width of the coefficient data input
into the filter when you select Signed Fractional
Binary as your coefficient data type.
Frequency Response Display
Edit Current Bank
0–Number of coefficient bank
-1
Specifies the coefficient bank to display in the
coefficient table and frequency response graph.
Import from file URL Specifies the file from which to load coefficients. .
Loading Coefficients from a File
When you import a coefficient set, the wizard shows the frequency response of the floating-point
coefficients in blue and the frequency response of the fixed-point coefficients in red.
UG-01072
2014.12.15
Coefficient Parameters 3-3
FIR II IP Core Parameters Altera Corporation
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