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Altera_Forum
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11 years ago

Problem with UART receive

Hi, I have designed a board with Cyclone-IV E FPGA with UART interface (just Rx and Tx) and some other connections. I built a Qsys system with NiosII/e processor, UART and some other peripherals...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
11 years ago

I finally fixed the bug. The problem was in the PCB. The connection to the DB-9 connector was wrong. Pins 2 & 4 were interchanged. The pins were arranged in reflected order. So Rx was not getting the signal. Now it is working great!