Pipelined FFT/IFFT 64 Points Processor

Pipelined FFT/IFFT 64 points IP core is a unit to perform the Fast Fourier Transform (FFT). It performs one dimensional 64 – complex point FFT. The data and coefficient widths are adjustable in the range 8 to 16.

Main Features:

• 64 -point radix-8 FFT.
• Forward and inverse FFT.
• Pipelined mode operation, each result is outputted in one clock cycle, the latent delay from input to output is equal to 163 clock cycles, simultaneous loading/downloading supported.
• Input data, output data, and coefficient widths are parametrizable in range 8 to 16
• Two and three data buffers are selected.
• FFT for 10 bit data and coefficient width is calculated on Xilinx XC4SX25-12 FPGA at 250 MHz clock cycle, and on Xilinx XC5SX25-12 FPGA at 300 MHz clock cycle, respectively.
• FFT unit for 10 bit data and coefficients, and 2 data buffers occupies 1513 CLB slices, 4 DSP48 blocks, and 2,5 kbit of RAM in Xilinx XC4SX25 FPGA, and 700 CLB slices 4 DSP48E blocks, and 2,5 kbit of RAM in Xilinx XC5SX25 FPGA, data buffers are implemented on the distributed RAM.
• Overflow detectors of intermediate and resulting data are present.
• Two normalizing shifter stages provide the optimum data magnitude bandwidth.
• Structure can be configured in Xilinx, Altera, Actel, Lattice FPGA devices, and ASIC.
• Can be used in OFDM modems, software defined radio, multichannel coding.

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