Question about using Pmod USB UART module in FPGA Posted September 25, 2019 · Edited September 25, 2019 by conanandai100 Hi, I am trying to use Pmod as UART to dump out some data from logic side of Zedboard, so I bought the Pmod USB UART module from digilent and connected it to Pmod JA (pretty sure my constraints are correct). My project worked perfectly before when I was using Spartan-3E and Nexys 2, both have a simple UART interface. I thought this module should work as well, but it didn't respond when I launched UART command from my python terminal by some reasons. I checked the specification: https://www.digilentinc.com/Pmods/Digilent-Pmod_ Interface_Specification.pdf then. The only difference is that there is no CTS or RTS in my project, but both are reserved on the UART module. I tried to disable them or set to low but not working. As it is said that CTS and RTS are optional in the pdf, I am trying not to modify my code which could lead to more issues. Is there anything I need to know when using this UART module? Or a demo to quickly verify how it work. Thanks!