Hi,
when I use ISE8.2 to do synthesis and P&R for my fpga (Virtex 4) design, I got such message:
WARNING:XdmHelpers:662 - Period specification "TS_u_DigRF_top_u_v4_clkgen_clk26_buf" references the TNM group "u_DigRF_top_u_v4_clkgen_clk26_buf", which contains both pads and synchronous elements. The timing analyzer will ignore the pads for this specification. You might want to use a qualifier (e.g. "FFS") on the TNM property to remove the pads from this group.
Does anybody knows what it mean and how to solve it? thanks very much.