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Altera_Forum's avatar
Altera_Forum
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21 years ago

How to Use Opencore's I2C IP for Nios?

hello everyone:

I integrated the Opencore's I2C core into SOPC builder.

But I don't know what PIN primitive for the SDA and SCL output should I place in the Quartus2's BDF design?

(a Output ,Input or Bidiretional pin?)

Please note that in the Opencore's I2C-spec document,it says that we have to add TRI-state buffers for

the SDA and SCL lines.

Please help me to get the I2C core work.

thanks very much.

Best Regards.

6 Replies

  • Altera_Forum's avatar
    Altera_Forum
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    21 years ago

    Hello trout,

    If you have integrated the I2C IP from Opencores into your system correctly there are only some more steps to bring it to work.

    1. Insert -> Symbol ...

    2. 2x primitives -> buffer -> tri

    3. 2x primitives -> logic -> not

    4. 2x primitives -> pin -> bidir

    5. connect "scl_padoen_o" and "sda_padoen_o" to the input of the "not"-logics

    6. connect "scl_pad_o" and "sda_pad_o" to the input of the "tri"-buffers

    7. connect the output of the "not"-logics to the corresponding output-enables of the "tri"-buffers

    8. name the output of the "tri"-buffers "i2c_scl" and "i2c_sda"

    9. connect "i2c_scl" and "i2c_sda" to the corresponding inputs of the I2C IP

    10. connect "i2c_scl" and "i2c_sda" to "bidir"-pins

    That's it!

    Bye,

    niosIIuser

    PS: Why can't we upload images? This function would be very helpful.
  • Altera_Forum's avatar
    Altera_Forum
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    21 years ago

    Hey Trout,

    Maybe you can post that SOPC Builder component into the IP section of the forum. I'm sure several others are interested in an Avalon I2C controller.
  • Altera_Forum's avatar
    Altera_Forum
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    21 years ago

    Done!

    please refer to "post your oun ip" section of the forum.

    The title is "Integrate the Opencores's I2C ip into SOPC".

    regards.
  • Altera_Forum's avatar
    Altera_Forum
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    15 years ago

    --- Quote Start ---

    Done!

    please refer to "post your oun ip" section of the forum.

    The title is "Integrate the Opencores's I2C ip into SOPC".

    regards.

    --- Quote End ---

    hi....

    i have the i2c hdl files which i got from opencores , i want to integrate this into sopc but finding some problems .can u just provide me the link of your project file as i am finding it difficult to find it in the forum.It would be helpful for me.

    regards Udayraj MP
  • Altera_Forum's avatar
    Altera_Forum
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    15 years ago

    Even I had used I2C verilog code from Opencores. I've successfully simulated it. But I'm unable to synthesize it in Synopsys synthesis tool.

    Can anyone help me out???