Quoting madhu_b63 at yahoo.co.in:
xlink/active-hdl etc.

First:

do you mean xilinx by "xlink"? Never heard of a "xlink" tool. If you target
Xilinx devices you'll probably need the free ISE (from xilinx website), for
Altera the Quartus etc for the other manufacturers.

All cores that i have downloaded from the opencores.org site include sources.
You might check my own (hwlu) although never really used in an FPGA (simulation
only) or some other core.

Hi,
I am new to this cores.I know that these are devoloped by someone
and uploaded to net and it is accesseble to anybody.But how we can use
it, is it a code that can be run by a tools like xlink/active-hdl etc.

Please help me in this regard.

Thank U