Be carefull. Usually when you instantiate a ibufg, you are actually instantiating a IOB configured as an input, and a bufg. You only want to use an IOB as the input and make sure it is loc'd to a clk input pin location.
As for your div/2, you can divide the input to the dll by 2 using the CLKIN_DIVIDE_BY_2 parameter. Don't know if this helps because the clk0 will be div/2 since the dll is dividing the input to the dll.
Markus Meng wrote: > Hi All, >
some notes I could not figure out directly from one of the XAPP132, 174 > from Xilinx. If I want to drive an Off-Chip device with half of the clkin > frequency > without using a GBUF driver, can I feedback the devided signal from the obuf > driving the pin through an IBUFG and still having the DLL functionality of > phase > shift an duty cycle correction. I read that the feedback signam MUST be > clkout > or 2xclkout. The problem is that I am running out of GBUF's in my design ... >
> markus >