IPR-FIR Altera, IPR-FIR Datasheet - Page 43

• Manufacturer Part Number: IPR-FIR
• Description: IP CORE Renewal Of IP-FIR
• Manufacturer: Altera
• Type: MegaCorer

Specifications of IPR-FIR

• Software Application: IP CORE, DSP Filters And Transforms
• Supported Families: Arria GX, Arria II GX, Cyclone, HardCopy, Stratix
• Core Architecture: FPGA
• Core Sub-architecture: Arria, Cyclone, Stratix
• Rohs Compliant: NA
• Function: Finite Impulse Response Compiler
• License: Renewal License
• Lead Free Status / RoHS Status: na
• Lead Free Status / RoHS Status: na

FIR Compiler
Number Systems and Fixed-Point Precision
Generating or Importing Coefficients
© December 2010 Altera Corporation
1
The FIR Compiler has an interactive wizard-driven interface that allows you to easily
create custom FIR filters. The wizard outputs IP functional simulation model files for
use with Verilog HDL and VHDL simulators.
The FIR Compiler function supports signed or unsigned fixed-point numbers from 4-
to 32-bits-wide in two's complement and signed binary fractional formats.
The entire filter operates in a single number system. The coefficient precision is
independent of input data width; you can specify the output precision.
You can use the FIR Compiler function to create coefficients, or you can create them
using another application such as MATLAB, save them as an ASCII file, and read
them into the FIR Compiler.
Coefficients can be expressed as floating-point or integer numbers; each one must be
listed on a separate line.
If you specify negative values for the coefficients, the FIR Compiler generates a two’s
complement signed number.
Figure 4–1
Figure 4–1. Sample Filter Coefficients
The FIR Compiler automatically creates coefficients (with a user-specified number of
taps) for the following filters:
■
■
■
-3.09453e-005
-0.000772299
-0.00104106
-0.000257845
.
.
.
-0.000257845
-0.00104106
-0.000772299
-3.09453e-005
0.00150377
0.00163125
0.00278506
0.00150377
Low Pass
High Pass
Band Pass
shows the contents of a sample coefficient text file.
4. Functional Description
FIR Compiler User Guide