Re: [oc] FPGA constraint problem

[Richard Herveille <richard@asics.ws>]

This is your I2C model right??
If you're really familiar with I2C (and you should), than you already know the 
answer.

Both SDA and SCL lines are bi-directional.
Global clock lines are input only.
So can you tie SCL to a global clock line???


> I'm currently trying test my I2C .vhd project.  But, when I tried to do
> the contraints on my spartan2 fpga.  it gives me error that I have to use
> SCL as GCLKIOB.
>
> Do I really need to tie the SCL pin to one of the GCK?
>
> Can I contrains the SCL to any other port?

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