DP83867IS: About the RX_CLK signal.

Kengo.Y

Part Number: DP83867IS

Hi team,

I'd like to know about the symptoms when the RX_CLK signal is shifted by 90 degrees.
Is the PHY specification that data changes at the edge of the clock？
If a 90-degree phase shift occurs, the data will not be received.

BR.
Kengo.

over 3 years ago

0 Hillman Lin over 3 years ago

TI__Mastermind 26255 points

Hi Kengo,

RX_CLK shifted by 90 degree mainly used to avoid any consequence of length mismatch or impedance mismatch within the design that result in not reading the wrong bit on the receiver side on the MAC.

Regards,

Hillman Lin

0 Kengo.Y over 3 years ago in reply to Hillman Lin

Guru 11515 points

Hi Lin,

Thank you for your reply.
Is it ok to assume that a 90-degree shift can be received without any problem as a PHY?

BR.
Kengo.

+1 Hillman Lin over 3 years ago in reply to Kengo.Y

TI__Mastermind 26255 points

Hi Kengo,

Yes, as long as Tx is in align mode and Rx is in shift mode. This should be good for RGMII interface.

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DP83867IS: About the RX_CLK signal.