[Libre-soc-bugs] [Bug 739] NGI POINTER Gigabit Router Pinout Considerations

bugzilla-daemon at libre-soc.org bugzilla-daemon at libre-soc.org
Tue Nov 16 10:36:43 GMT 2021


--- Comment #18 from Luke Kenneth Casson Leighton <lkcl at lkcl.net> ---
(In reply to Cesar Strauss from comment #17)
> (In reply to Luke Kenneth Casson Leighton from comment #16)
> > * one I2C CLK 400 mhz max (hm we need pullup and Open Drain for that)
> Standard mode I2C is 100 KHz, fast mode is 400 KHz. It seems 3.4 MHz is
> possible. Certainly not 400 MHz...

whoops, i meant 400 khz :)

> The pullup can be external, I think.

yes.  2.2k is the nominal termination resistor for I2C i've seen in use,
some use 4.7k or 10k.  so it can't be internal because of differences
in practical real-world usage.

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