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DVI-D接口连接TFP401A问题

Other Parts Discussed in Thread: TFP401A, TFP401

我想用TFP401A接收DVI 接口的信号,为什么DVI连接到板子上,没有信号输出呢?DVI接口的5V电源输出是有的。当DVI直接接到显示器上,是正常显示的。

板子上hot plug det是连接到3.3V的,clk,data0,data1,data2三对差分线接到TFP401相应的接口。

请大神们分析下是什么原因,还是有什么管脚没连造成了DVI接到板卡上没输出?