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Altera_Forum's avatar
Altera_Forum
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15 years ago

I2C Woes, Opencore and Terasic

I've been trying to get a functional I2C bus in my design for a while now with no luck. I've tried my own and a few open source cores. ALL of them have the same problem. I never receive ACKs. I canno...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
15 years ago

This problem troubled me for about 4 weeks, until I changed

assign scl_pad = scl_padoen_o?1'bz:scl_pad_o;

into

assign scl_pad = scl_padoen_o?1'b1:scl_pad_o;

Really a pain in the back.

There is no difference in the waveform captured by oscilloscope.

Can anyone explain why?