AFS060

The CoreFIR is an Actel FPGA-optimized RTL generator that produces a finite impulse response filter. AFS060 implements the DA algorithm to eliminate multiplication for faster and smaller designs. The CoreFIR is a generator which utilizes Actel FPGA's embedded RAM blocks as DA lookup tables (when available) to further reduce the size of the design. The generator also reads the user system clock rate and data sample rate to explore using a folding or serial architecture to further reduce size, especially when the system clock rate is much greater than the data sampling rate. The generator automatically switches to the use of multiple DA lookup tables when the requested FIR filter has a large number of taps. Figure 2 shows the functional block diagram of a generated FIR filter design. More complex designs of AFS060 may contain multiple lookup tables, accumulators, or control sections.