No clock signals found in design...

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Whenever i synthesize i top level block in xilinx, i get this msg, "No clock signals found in design", so i dont get information about the clock speed or clock delay; this is wierd since i have a central clk signal that drives a lot of Flip flops

how do i correct this in synthesis? how do i make xilinx realize i have a clk sig that needs to be treated appropriately? i have no IBUFs, or CLKBufs in design
 

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