DP83867IR: Optimize startup time

user761594

Part Number: DP83867IR

Hi，

During initialization, it was found that auto-negotiation between mac phys took more than 4s. Is there an optimized startup method?

Thanks

B&R，

Hardy

over 4 years ago

0 Justin Lazaruk over 4 years ago

TI__Expert 7040 points

Hi Hardy,

Thank you for your question. Can you please provide the MAC interface and data-rate that you are using?

Regards,

Justin

0 user761594 over 4 years ago in reply to Justin Lazaruk

Prodigy 50 points

Hi Justin，

The interface is RGMII and the date-rate is 1000Mbps.

B&S,

Hardy

0 Justin Lazaruk over 4 years ago in reply to user761594

TI__Expert 7040 points

Hi Hardy,

Understood. 4 seconds is within the standard range to complete auto-negotiation. There is no standard Ethernet specification regarding auto-negotiation completion time so there are not any optimization features I can provide now.

Regards,

Justin

0 user761594 over 4 years ago in reply to Justin Lazaruk

Prodigy 50 points

Hi Justin，

Can I not wait for the link status during auto-negotiation? I tried it, and the result is that the sending direction can send data, and the receiving direction has no data, somehow?

B&R，

Hardy

0 Justin Lazaruk over 4 years ago in reply to user761594

TI__Expert 7040 points

Hi Hardy,

One item you can try to reduce the time for link-up is to disable the Auto-MDIX feature. You can force MDI or MDIX mode through strap configuration or register and skip the auto-MDIX protocol to speed up time to establish link.

Without link you will not be able to receive data. Can you confirm how you are sending data from the DP83822 without link? Are you using a custom driver?

Regards,

Justin

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DP83867IR: Optimize startup time