于 Thu, 10 Jun 2021 16:57:29 +0200 Andrew Lunn <andrew@xxxxxxx> 写道: > > Here is Ingenic's reply, the time length corresponding to a unit is > > 19.5ps (19500fs). > > Sometimes, there is a negative offset in the delays. So a delay value > of 0 written to the register actually means -200ps or something. Ah, perhaps this explains why we still need to add fine-tuning parameter in rgmii-id and rgmii-txid modes to ensure that the network works properly. > > Andrew
