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參數(shù)資料
| 型號(hào)： | FIR Filters |
| 廠商： | Altera Corporation |
| 英文描述： | FIR Compiler(有限的脈沖響應(yīng)濾波器) |
| 中文描述： | 飛行編譯器（有限的脈沖響應(yīng)濾波器） |
| 文件頁(yè)數(shù)： | 3/19頁(yè) |
| 文件大?。?/td> | 323K |
| 代理商： | FIR FILTERS |
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Altera Corporation
3
FS 1: FIR Filters
Parameters
The following FIR filter parameters can be defined by the user:
I
I
Data Width
Coefficient Precision
for the FIR filter, independent of the data width setting.
Internal Precision
(
internal_p
internal calculations in the FIR filter.
Output Precision
(
output_p
output data. This value can be different from the internal
precision.
Pipelined/Non-Pipelined Design
choose between a fully pipelined or non-pipelined design, the
main filter design program, FIRGEN, creates the
accordingly. A fully pipelined design results in the maximum
operating frequency with no extra device area usage.
Symmetrical/Antisymmetrical Filters
Designers can specify whether the filter is symmetric or
antisymmetric. Symmetrical FIR filters implement even
functions with symmetric tap adders. Designers can create an
antisymmetric FIR filter that implements an odd function by
using symmetric tap subtractors. FIRGEN allows the designer to
specify symmetrical or antisymmetrical coefficients.
Coefficients
—FIRGEN automatically generates an AHDL
Include File (
coef.inc
)
that specifies vector table representations
of filter coefficients. Designers specify the original file
containing coefficients to FIRGEN, which then computes the
vector tables and adds them to
coef.inc
coefficients are specified at compilation, they are not parameters
because they are defined by constants in the
than one filter exists in the design, modify a copy of the top-level
Text Design File (
.tdf
) file (e.g.,
fir_08tp.tdf
name of the Include File (
coef.inc
(
width
)—The width (in bits) of incoming data.
(
rom_p
)—The width of the coefficients used
I
)—The precision (in bits) of
I
)—The precision (in bits) of the
I
(
pipelined
)—When designers
coef.inc
file
I
("
sym
"
or
"
anti
")—
I
. Although the
coef.inc
file. If more
) and change the
).
Parameters vs. Ports
Parameters, which are variables established at design time,
determine the configuration of the filter. Parameters cannot be
changed once the filter has been designed and is operating in-circuit.
In contrast, ports refer to the in-circuit I/ O ports, including the I/ O
data, Clock, and Reset.
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