quarteus警告Critical Warning: The following clock transfers have no clock uncertainty assignment.这类问题

quarteus警告Critical Warning: The following clock transfers have no clock uncertainty assignment.这类问题

参考.html
我的sdc文件命名的时钟是clk_50
如果点开出现

Critical Warning: From clk_50 (Rise) to clk_50 (Rise) (setup and hold)

这种需要在sdc文件添加

set_clock_uncertainty -hold -rise_from clk_50 -rise_to clk_50 0.150
set_clock_uncertainty -setup -rise_from clk_50 -rise_to clk_50 0.150

主要是看从哪到哪，该警告是rise_from clk_50 rise_to,括号是有哪个就添加哪句话（setup and hold）
如果是

Critical Warning: From clk_50 (Fall) to clk_50 (Rise) (setup and hold)

那就是fall_from clk_50 rise_to，根据实际进行添加
如果还有

Critical Warning: From altera_reserved_tck (Rise) to altera_reserved_tck (Rise) (setup and hold)

这类提示
同理
添加

set_clock_uncertainty -setup -rise_from altera_reserved_tck -rise_to altera_reserved_tck 0.150

set_clock_uncertainty -hold -rise_from altera_reserved_tck -rise_to altera_reserved_tck 0.150

根据警告内容照着改就行。