Re: CRC errors between mvneta and macb

[Richard Genoud]

Le 19/10/2018 Ã 17:44, Willy Tarreau a ÃcritÂ:
> On Fri, Oct 19, 2018 at 05:15:03PM +0200, Richard Genoud wrote:
>> When there's a CRC error, the TXCLK has its polarity inverted...
>> That's a clue !
>>
>> But this TXCLK (25MHz) is not used on the g35-ek.
>> Only the REFCLK/XT2 (50MHz) is used to synchronise the PHY and the macb.
>> So I guess that the TXCLK has a role to play to generate TX+/TX-
> 
> Well, just a stupid idea, maybe when this signal is inverted, the TX+/TX-
> are desynchronized by half a clock and are not always properly interpreted
> on the other side ?
> 
> Willy
> 

I must admit that I'm not familiar with the PHY internals, I'll have to
dig into that.

Richard.