一个fpga中pll的问题
CriticalWarning:Inputpin"clk_sam"feedsinclkportofPLL"PLL_CLK_SAM:inst55|altpll:altpll...
Critical Warning: Input pin "clk_sam" feeds inclk port of PLL "PLL_CLK_SAM:inst55|altpll:altpll_component|pll" by global clock - I/O timing will be affected
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