1. M.D. Anu, I2C to SPI Bridge. AN49217. Document No. 001-49217 Rev. **. Cypress Semiconductor (2008)
2. A. Bhat, The unlikely origins of USB, the port that changed everything (29.5.19) https://www.fastcompany.com/3060705/an-oral-history-of-the-usb
3. J.M. Birkner, PAL Programmable Array Logic Handbook (Monolithic Memories, Santa Clara, 1978)
4. Full Speed USB (USBFS) 3.20. Document Number: 002-19744 Rev. *A. Cypress Semiconductor (2017)
5. I2C Master/Multi-Master/Slave2.0. Document Number: 001-62887 Rev. *B. Cypress Semiconductor (2013)