DP83867CR: RGMII timing

NAOKI AOYAMA

Guru 11215 points

Part Number: DP83867CR
Other Parts Discussed in Thread: AM4376

Hello,

Our customer use the DP83867 for PHY and the AM4376 for MAC.

The customer want to know the specification of RGMII timing.

For using the DP83867, how much the Skew of the Rx signal, the setup and hold of the Tx signal?

Which parameter should the customer refer to?

Best Regards,

Naoki Aoyama

over 7 years ago

0 Ross Pimentel over 7 years ago

TI__Mastermind 23675 points

Hi Naoki,

We have this information in both the datasheet under Timing parameters and in this app note: www.ti.com/.../snla243.pdf

Please let us know if there are any specific questions related to the two documents.

0 NAOKI AOYAMA over 7 years ago in reply to Ross Pimentel

Guru 11215 points

Hello Ross,

Thank you for your reply.
I didn't know the clock and the data are generated at the same edge.
So, it need a delay by layout on the PCB or PHY buffer.

In the figure 5 on the datasheet, RXC (Source of DATA) is PHY and RXC(at Receiver) is MAC.
Is my understanding correct?

Best Regards,
Naoki Aoyama

0 Ross Pimentel over 7 years ago in reply to NAOKI AOYAMA

TI__Mastermind 23675 points

Your understanding is correct. Please use internal delay within either the MAC or PHY.

0 NAOKI AOYAMA over 7 years ago in reply to Ross Pimentel

Guru 11215 points

Hello Ross,

Thank you for your reply.
I will feedback the customer the information.

Thanks,
Naoki Aoyama

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DP83867CR: RGMII timing