Re: [oc] Application of the i2c core to Xbox hacking

[Richard Herveille <richard@asics.ws>]

I read this story a while ago. What I did to make the tristate insertion 
easier is to add examples to the documentation.
However I feel that it shouldn't have been a problem in the first place.

Note that I2C uses a wired-AND, not a wired-OR.

Richard


> I was just reading the documentation from the Xbox
> hacking project and came across this:
>
>   "Using an Opencores wishbone-compliant I2C interface
>   by Richard Herveille and my flashburn rev 2 board, I
>   managed to snarf the contents out. (getting the core
>   to compile to my Xilinx Spartan FPGA sucked, btw. Lots
>   of hairy issues with the use of a tristate-buffer with
>   input tied to zero to do wired-OR bus signalling and
>   an overzealous synthesis optimizer :P)"
>
> URL: http://www.xenatera.com/bunnie/proj/anatak/xboxmod.html
>
> Neat to see someone is using opencores stuff.  If it hasn't been
> done already, it might be good to address the tri-sate issue.
>
> Best wishes
> John

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