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Coefficient Specification
The core enables specification of the FIR filter constant coefficients and constant coefficient sets as an
ASCII text file (* .txt). Create the coefficient file using a text editor. Figure 47 and Figure 48 show the file
formats for the multiple and single constant coefficient sets. N and m signify numbers of filter taps and
coefficient sets, respectively. Coefficient values must be entered as integer numbers. For a symmetric or
anti-symmetric filter, only half of the coefficients must be listed in the file (applies to the Fully Enumerated
type only).
coefficient_set_1
C(1)(0)
C(1)(1)
...
C(1)(N-1)
coefficient_set_2
C(2)(0)
C(2)(1)
...
C(2)(N-1)
...
coefficient_set_m
C(m)(0)
C(m)(1)
...
C(m)(N-1)
Figure 47 · Multiple Coefficient Sets File Format
coefficient_set_1
c(0)
c(1)
...
c(N-1)
Figure 48 Constant Coefficient File Format
The file format is as follows:
1.
2.
The filter coefficients can be presented in decimal, hexadecimal, or binary formats. In decimal format
(radix-10) negative values are accepted; for example, –25. In hexadecimal and binary formats (radix-16,
radix-2), present negative values in two’s complement format; for example, 7-bit –25 = 0 x 67 = 110
0111.
Only one coefficient value per line is permitted.
CoreFIR v8.5 Handbook
55
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