大家好。请教大家一个问题。我用的ECP3-70EA。寄存器和查找表大概用了65%左右。8个primary clock都用完了。我用了两组PCS。接受8路视频信号。一共8个rx_clk。rx_clk跑156.25M。然后这些时钟的时序很难跑过。主要是保持时间。我觉得是rx_clk没有走得专用时钟网络。skew比较大导致的。请问该怎么解决这个问题。如果rx_clk要走专用时钟网络该用那种时钟资源。
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primary clock是有64路的，每一个primary可以分为4个quadrant:TR，TL，BL，BR，每一个quadrant有16路primary,具体信息参见《LatticeECP3 sysCLOCK PLL/DLL Design and Usage Guide》，你可以试试均匀地分配这些时钟网络。如果主时钟网络不行可以试试secondary。