OVS在第15、16頁有解釋,看你 I2C 上的 R side 電壓選擇去。3 v6 N5 C% t. e* T
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PRE 是 TMDS Output de-emphasis adjustment ,可以先預留2個電阻,上拉和下拉電阻,等調適的時候看看哪個效果好,再決定。 / \4 F: y# ^. Z `原文在第15頁。節錄於下方。$ O5 K7 ^7 j0 v1 _7 P- s
The PRE pin provides 3dB de-emphasis, allowing output signal pre-conditioning to offset interconnect losses from the TMDS141 outputs to a TMDS receiver. PRE is recommended to be set low while connecting to a receiver throw short PCB route.