DP83869EVM: fiber link is up but no internet connnection

Palak Shah1

Part Number: DP83869EVM
Other Parts Discussed in Thread: DP83869

Hi,

I have a DP83869 EVM connected using RGMII to our board. I have the linux driver that I received from TI. On our board, we have fiber only, no UTP. If copper is connected, then its internally converted to fiber.

When I configure the mode to "1000 Media convertor", it shows that fiber link is up. Register 0xc01 is set to 616D. Bit [2] of Register 0xc01 is for link up or down.

However, there is no internet connection. Am I missing something here?

Also, if I configure the mode to RGMII to 1000 BASE X, the link is always down. I need some help on TI to debug this futher. How do I get the internet working?

Thanks.

over 5 years ago

0 Ross Pimentel over 5 years ago

TI__Mastermind 23675 points

Hi Palak,

Do you see the copper showing link?

Are you enabling auo-negotiation on the copper side?

Please follow the datasheet recommendation for enabling media converter mode.

0 Palak Shah1 over 5 years ago in reply to Ross Pimentel

Prodigy 20 points

Hi Ross,

I do see the copper link showing up.

I did the following to set the 1000 Media convertor mode.

After configuring register 0x01DF, perform the following operations.

• Write 0x1140 to register 0x0000

• Write 0x5048 to register 0x0010

• Write 0x1140 to register 0x0C00

Then when I check the link, I get

The link is up bit [2].

But even with the link up, there is no internet connection. Any idea any?

Thanks

Palak

0 Ross Pimentel over 5 years ago in reply to Palak Shah1

TI__Mastermind 23675 points

Hi Palak,

Are you also setting bit[0] in register 0x1EC to 0b0?

Because of the holidays, TI E2E™ design support forum responses will be delayed from Dec. 25 through Jan. 2. Thank you for your patience.

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DP83869EVM: fiber link is up but no internet connnection