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Message
From: matt at ettus.com<matt@e...>
Date: Thu Apr 12 12:13:40 CEST 2007
Subject: [oc] recent i2c questions
> [rih] What do you mean it wasn't clear from the docs??
> This is the 3rd person claiming this, so apparently it isn't clear.
> But the doc explicitly explains how to create the open-drain from
> the
> tri-state buffers. It actually says i2c uses open-drain and that
> the
> open-drain is implemented with tri-states.
> There's a graphical representation and VHDL and Verilog codes on
> how to
> implement the pads. What else do you need???
> (the other) Richard
In the diagram, it shows scl_pad_o going to the tri-state buffer
input. If it had shown a 0 going to the buffer, or had stated that
scl_pad_o is always 0, then it would have been clear. Without that,
it just basically says that you need to create an open drain, but
shows using a tri-state buffer.
Thanks,
Matt
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