I realized realtime IIR-filters for audio signal processing in a FPGA.
See my YouTube video here: https://www.youtube.com/watch?v=eE6Qwv997cs.
The used hardware is a TinyFPGA-BX board (see here: https://tinyfpga.com/ ) and a PMOD I2S2 Board (see here: https://store.digilentinc.com/pmod-i2s2-stereo-audio-input-and-output/)
The whole systems runs at 96 kHz sampling-frequency with a FPGA system-clock of 25 MHz (internal PLL used). The left channel is low-pass filtered at 1 kHz and the right channel is high-pass filtered at 1 kHz.
See in attach the VHDL-source files, screenshots of the simulation of I2S-RXTX and IIR filter and the original iCEcube2 project files
The ADC/DAC board is connect to the FPGA board via following pinout:
PIN24 - ADC-MCLK
PIN23 - ADC-BCLK
PIN22 - ADC-LR
PIN21 - ADC-DATA
PIN20 - DAC-MCLK
PIN19 - DAC-BCLK
PIN18 - DAC-LR
PIN17 - DAC-DATA