Forum Discussion

Michael-C's avatar
Michael-C
Icon for New Contributor rankNew Contributor
2 years ago

Nios-II Resets with PIO command

I am developing an application using the Nios-II embedded CPU. It utilizes multiple PIO ports, configured as inputs and outputs. I have one in particular that is being very troublesome. Everytime I w...
Nios Cpu
wwanalim_intel's avatar
wwanalim_intel
Icon for Contributor rankContributor
2 years ago

Hi Michael,


From the email, it seems the problem down to the i/o of the FPGA.


Can we know what the device you are using along with the device number?


Regards,

Fathulnaim


Michael-C's avatar
Michael-C
Icon for New Contributor rankNew Contributor
2 years ago

I am using the Cyclone IV series, specifically the EP4CE40F23C8N.

I changed six of the 22 330ohm resistors to 1.91k ohms. Of those six, two of those outputs started working. That is they remain in a tristate mode. When required, the output goes low able to drive the input to the solid state relay low and enable the output. The other four (of the six), remain tristate. However, when any one of those is set to a low, it causes the FPGA to restart. Of those four, I replaced the solid state relay, incase that one was bad, and it did the same thing.

On a separate note, is there anyway to quickly get to this thread to reply w/o having to search through all of the threads to find this particular one?