FIR II IP Core: User Guide

ID 683208
Date 8/14/2023
Document Table of Contents

3.3.1. Loading Coefficients from a File

When you import a coefficient set, the FIR II wizard shows the frequency response of the floating-point coefficients in blue and the frequency response of the fixed-point coefficients in red. The FIR II IP core supports scaling on the coefficient set.
  1. Click Import coefficients, in the File name box, specify the name of the .txt file containing the coefficient set.
    • In the .txt file, separate the coefficients file by either white space or commas or both.
    • Use new lines to separate banks.
    • You may use blank lines as the FIR II IP core ignores them.
    • You may use floating-point or fixed-point numbers, and scientific notation.
    • Use a # character to add comments.
    • Specify an array of coefficient sets to support multiple coefficient sets.
    • Specify the number of rows to specify the number of banks.
    • All coefficient sets must have the same symmetry type and number of taps. For example:
# bank 1 and 2 are symmetric
1, 2, 3, 2, 1
1 3 4 3 1

# bank 3 is anti-symmetric
1 2 0 -2 -1

# bank 4 is asymmetric
    Note: The file must have a minimum of five non-zero coefficients.
  2. Click Apply to import the coefficient set.

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