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TFP401A: The issue of the DE signal waveform

Part Number: TFP401A

Hi ,

    I probed the relation between DE and HV . DE is high when data is vailable in active area. But  sometime I find another high pluse DE signal , in the same HV Low pluse. The DE pluse width is about 260ns.

Is it normal for the chip? And have any resonable explanation? Waveform shown as follow. Thank you.