RMII 引脚映射表如下所示。 执行ping 命令时、 RMII[1]和端口0 MAC 之间的 RMII TXD[x]行显示一些信号 但端口1中没有信号 示波器屏幕截图图像如下所示。 顶部的黄线是 REF_CLK 线、底部的蓝线是 RMII TXD1线 此处测得的延时时间为4.680ns。 它对应于下图中的 RMII6 以...
"MUST BE CONNECTED WHEN WORKING IN RMII MODE" I understand that the TXD[3:0] are pulled down by internal resistor. Could you please tell me why the TXD_3 pin must connect to the GND through the pull down resistor? In addition,does the TXD_2 pin not have to connect ...