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Altera_Forum
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12 years ago

How to let FPGA get access to HPS pins

I've got an Arrow SOCkit and it has a USB-UART connected to the HPS' pins, but I'd like to access the UART from the FPGA logic. Is this possible? If so how is it done? Thank you!
Altera_Forum's avatar
Altera_Forum
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12 years ago

Hi Dez74,

If you want to use LOANIO61/LOANIO62 for UART0, you can set the "UART0 pin multiplexing" to "HPS I/O Set 1" in QSys instead of routing it to the FPGA. Then you can just route to I/O ports in the top file, and during compilation it will automatically set those pins to B25 and C25.

As for the error (169026), this is due to the HPS_UART_RX/TX pins being set to 3.3V, while the bank is at 2.5V. In the pin planner, set the I/O Standard of these pins to 2.5V.

Marcopoliptica