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Difference between BUFGDS and IBUFDS on clocks

Dear all, I'm a little bit confused about the usage of IBUFGDS and IBUFDS. In my design (on a XC2V8000 fpga) I have to acquire LVDS input data using a LVDS clock which comes from an external board. It is not really clear to me which is the best between these 2 options

1) use IBUFGDS on clock and then drive a BUFGMUX

2) use IBUFDS on clock and then drive a BUFGMUX

Data input goes to IBUFDS. In both cases the output of BUFGMUX is a global line, so I don't understand which is the best option and the differences between IBUFGDS and IBUFDS.

Any advice about that ?

Thanks in advance.

Reply to
g. giachella
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