Re: gEDA-user: OT: (Vhdl help)

[Ben Jackson <ben@xxxxxxx>]

On Thu, Jun 26, 2008 at 11:07:49PM +0100, Peter Clifton wrote:
> 
> This is similar to the code in the Xilinx I2C entity.
> 
> When I try to assign from the input port of the IOBUF using similar
> code, I just end up getting this error.
> 
> http://www.xilinx.com/support/answers/14264.htm

Right, FPGAs don't really have internal tri-state (or wired-or) busses.
If you had two I2C modules connected to the same pins, the I/O/T model
allows you to combine them at one output.  If the module just took 'SDA'
and did the tri-stating internally then I would expect you to get that
error when you connected another I2C module.

-- 
Ben Jackson AD7GD
<ben@xxxxxxx>
http://www.ben.com/


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