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From: CMOS on 17 Oct 2005 11:20
hi,
im trying to use i2c open source core available from opensorces.org and
having problems with cofiguring the "scl" and "sda" from the top level
design with the use of IO buffers. if anyone got experience on how to
correctly configure these two ports from a top level hierachy, pls let
me know.

thank you.
CMOS

From: Symon on 17 Oct 2005 19:57
Hello CMOS,
Sadly, I've spent the last fortnight following your advice.
http://tinyurl.com/76ovq
Trouble is, my eyesight has been badly affected. Could you post in a bigger
font? That would.... omigod, what's s/he going to do with THAT?
Cheers, Syms.
p.s. So, normally from an FPGA clock is an output, try searching for OBUF in
the libraries guide. Data is bi-directional (like a large percentage of the
folks on those sites you recommended) so look for OBUFT and IBUF. ;-)


"CMOS" <manusha(a)millenniumit.com> wrote in message
news:1129562457.464856.260830(a)g43g2000cwa.googlegroups.com...
> hi,
> im trying to use i2c open source core available from opensorces.org and
> having problems with cofiguring the "scl" and "sda" from the top level
> design with the use of IO buffers. if anyone got experience on how to
> correctly configure these two ports from a top level hierachy, pls let
> me know.
>
> thank you.
> CMOS
>


From: CMOS on 17 Oct 2005 23:32
here we go again...showing off stupidity....

From: Bevan Weiss on 18 Oct 2005 02:06
CMOS wrote:
> here we go again...showing off stupidity....
>

Well he has been your only reply, so perhaps you should just humor him
some and leave his comments be.

Other than that, he wasn't far off. I2C is a shared interface, usually
using open drain/collector pull-down connections. So it will require
the use of a tri-state output buffer. You will simply set the output
value to always be a low value (ie always pulling low) and the only
signal that will be controlled for the pin is the output enable.
Both pins should be bi-directional, to be capable of operating in either
master/slave mode, and to tolerate clock stretching.

So as long as you assign the output signals from your I2C module to
tri-statable pins everything should be ok.

Is that what you're after?
From: c d saunter on 18 Oct 2005 14:13
CMOS (manusha(a)millenniumit.com) wrote:
: here we go again...showing off stupidity....

Yay veriily, showing off with an understanding of capitalisation no less,
and even providing an on topic response to someone who's heading for my
usenet killfile...

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