ERROR:Pack:1107 - Unable to combine the following symbols into a single IOB component: PAD symbol "gclk3_i" (Pad Signal = gclk3_i) BUF symbol "UPAD_CLK3" (Output Signal = hpi_clk) 또, 이 err를 해결해 보기 위해 xilinx forum에 들렸다... 누군가가 Try this Project--> clean up project files and resynthesize your design 이렇게 해보라고 해서 해 봤지..