10.1.15.1 FIR Filter Functionality

The FIR filter core supports symmetric, high-speed, parallel FIR filters with up to 64 time taps.

Figure 10-23. Tap Transposed from FIR Filter
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The architecture is a variation of the "transposed form" of the FIR filter, as shown in the previous figure, utilizing the signed Constant Multiplier. The data is assumed to be signed. Data and coefficient widths are the same (D_WIDTH).

The FIR filter previous figure suggests that coefficients with a value of 0 are desirable for this type of architecture since they do not generate any multiplication hardware. "Halfband" filters try to maximize the number of 0-coefficients and might result in significant area savings over regular filters of the same order.