DP83TC814R-Q1: RGMII spec

Ted Xu

Expert 4635 points

Part Number: DP83TC814R-Q1

Tool/software:

Hi BU team

Would you help share the RGMII spec marked by red? Customer didn't find them in the datasheet.

T_hold(shfit), T_setup(shfit), T_skew(shift)

Thanks

6 months ago

0 Nick Peabody 6 months ago

TI__Genius 9209 points

Hi Ted,

The figures in the DP83TC812 datasheet are more up to date.

A minimum of 1ns setup and 1ns hold time must be maintained at the input of the receiver. In RGMII RX shift mode, the PHY shifts RX_CLK ahead of RX_Data signals by roughly 3ns.

See https://www.ti.com/lit/ug/snla431/snla431.pdf

Best regards,

Nick

0 Ted Xu 6 months ago in reply to Nick Peabody

TI__Expert 4635 points

Hi Nick

Don't find the specs of T_hold(shfit), T_setup(shfit) in TC812 datasheet.

Pls share them.

Thanks

0 Nick Peabody 6 months ago in reply to Ted Xu

TI__Genius 9209 points

Hi Ted,

The receiving Tskew values will not be in our datasheet since it is controlled by the MAC. Thold(shift) and Tsetup(shift) should follow the requirement of a minimum of 1 ns, with the maximum being around 3-4 ns.

Best regards,

Nick

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DP83TC814R-Q1: RGMII spec