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Yevpator's avatar
Yevpator
Icon for New Contributor rankNew Contributor
1 year ago

Avalon I2C core failure

Hi folks
I use Avalon I2C core in Arria-ii/NIOS-ii. I wanted to test what happens in case of failure on the i2c bus. For that I connected the i2c data line to ground for a short time. I expected i2c to stop working while i2c data pin is connected to the group and then to recover. However i2c stops working as result of this experiment. Why? I tried to re-init the i2c core in the NIOS-ii SW, but that didn't resolve the problem. Resetting Nios does recover the j2c core.
I can do another experiment by disconnecting a pin of one of the i2c slaves or applying to a non-existing i2c device, but now i want also understand why this short circuit to ground is so disruptive. Do you think this issue should be addressed? How? I didn't find a reset bit in any of the core registers. I found only disable/enable core bit.
Thank you for any help!
Nios Cpu

3 Replies

  • Jeet14's avatar
    Jeet14
    Icon for Frequent Contributor rankFrequent Contributor
    1 year ago

    Hi,


    How you have done the ground for short time, is it the wire from the I2C data line or PCB permanent?

    Is it possible to share the I2C schematic diagram that you are using?


    And, resetting the I2C register. I2C IP core has to be reset by the Reset manager. This I2C IP core has only the enable and disable bit registers.


    Regards

    Tiwari


  • Jeet14's avatar
    Jeet14
    Icon for Frequent Contributor rankFrequent Contributor
    1 year ago

    Hi,


    Let me know if you have any question on this.


    Regards

    Tiwari


  • Jeet14's avatar
    Jeet14
    Icon for Frequent Contributor rankFrequent Contributor
    1 year ago

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