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Altera_Forum
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17 years ago

Error while simulating with ModelSim

Hello guys I'm still a very beginner in Quartus II and FPGA programming in general. I'm still trying to run the simple example of hello world available in the quartus folder using the altera...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
17 years ago

Thank you for your response. Thanks to your help i made big progress and i'll soon be able to help those who have the same problem i had (specially while trying to simulate the very simple "hello world" example, Altera AN 351).

In fact now i'm able to add the IPs (with SOPC Builder), to generate the VHDL files, create and build the project with Nios IDE, and then running the simulation with modelsim by entering "s". Though i can't find the "hello world" phrase in the txd signal ( signal out of the UART according to documentation).

The error seem to be in the UART since the uart rxd signal is Undefined (in red in modelsim) and txd value has always "1" so i suspect the program is not processed (simulated actually) or there's a communication problem (nios - uart) or even the architecture i've designed with SOPC is malfunctionning. I've used 3 IPs : the cpu nios, the onchi memory and the UART.

Please any ideas? (this shoul be the final step ! )

thanks and read you soon