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uart ip: can't get rx data

Altera_Forum
Honored Contributor II
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I generated an uart core from qsys and made a simulation with modelsim.  

I instantiated two uart (one as transmitter and one as receiver); I connected the "uart_0_external_connection_txd" pin of the transmitter to the "uart_0_external_connection_rxd" pin of the receiver. 

The uart transmitter seems work properly but I can't get the signal "uart_0_s1_dataavailable=1" from the receiver uart and the rxdata register is always 0. 

Do you have any suggestion? 

Thank for your help
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Altera_Forum
Honored Contributor II
287 Views

Do you have a pull up resister configured in your receiver?

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Altera_Forum
Honored Contributor II
287 Views

Hi Galfonz, 

thank you for your reply. 

I'm using the uart core for simulation purpose in modelsim. I don't think I can put a pull up resistor for simulation. How can I do that?
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