刚开始用Xilinx FPGA和ISE开发环境,用counter做了一个简单的时钟分频,其中一个信号sclk_out(3)引到了内部模块和外部的pin脚上,但是在Impletement Design, translate这一步报错。
ERROR:NgdBuild:770 - BUFG 'XLXI_14' and BUFG 'XLXI_14' on net 'sclk_out<3>' are
lined up in series. Buffers of the same direction cannot be placed in series.
ERROR:NgdBuild:924 - input pad net 'sclk_out<3>' is driving non-buffer
primitives: