IP Cores

There are several excellent open-source resources where you can find, download, and integrate IP cores into your FPGA or ASIC projects.

OpenCores

https://opencores.org/projects

GitHub Repositories

https://fabriziotappero.github.io/opencores-scraper/cores.html

https://github.com/Digilent/Pmod-I2S2/blob/master/shared/src/hdl/axis_i2s2.v