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DS90UB948-Q1: 948的哪个寄存器可以知道是否有接收到视频信号。

Part Number: DS90UB948-Q1

Hi 

      请问948的哪个寄存器可以获取到视频信号的状态,就是能知道948是否有接收到芯片信号。

谢谢!