DP83869EVM: 100 Mbps Media Converter - DP83869EVM - Strap Only

Hello Ynouss DIALLO,

You should be able to configure the DP83869 device for media conversion without any strap.

Please refer the below documents to understand DP83869 configurations.

https://www.ti.com/lit/an/snla318/snla318.pdf

Regarding the configuration, it is best to sketch a block diagram - drawn or hand written to understand the implementation.

Regards,

Sreenivasa

Hello Kallikuppa, 

Thank you for your response. But my question was using the DP83869evm with only the strap configuration. I already used the datasheet "Understanding different modes of operation in DP83869" to configure the evaluation board but it is not working accordly

This is the block schematic of the setup : 

We applied the following configuratiion 

Unfortunetly your answer does not help me. 

Can you please give me more answer to help me ? 

Hello Ynouss DIALLO,

Thanks for the inputs. Please attach the drawing to view. 

Please refer to https://www.ti.com/tool/TIDA-00306

Yes, you should be able to use the EVM as a media converter with only strapping of pins.

Regards,

Sreenivasa

Hello Sreenivasa,

I'm not using the TIDA-00306 Media converter but the DP83869EVM. And as state i already dive into the documentation but it's not working. 

My question is :

- Base on the strap configuration, is that something that need to be done to communicate using the media converter on the DP83869EVM ? I tried the configuration present on the spec and it's not working

- In order to debug and find a way out, is there any register that i can look into to check that the link is up ? 

Best reargds

Ynouss

Hello Ynouss DIALLO,

Please read through the design guide for TIDA-00306.

One of the option uses DP83869 EVM as media converter and configurations are listed in detail. This should help you to a good extent.

BMSR Register Field can be used 

Regards,

Sreenivasa

Thank you Sreenivasa, 

During our investigation we found the documentation you suggest to read the "TIDA-00306". Unfortunetly after using the configuration strap suggest, the communication was still not working. 

The configuration test propose in the document is slighlty different from the one we are using because it is using two EVM to demonstrate the communication by  putting them in EMI chamber.

Hi,

For the Configuration used on the board :

100 Mbps Media Converter

JTAG_TDO / GPIO_1 ->  OPMODE_0 : Pull-up to VDDI

RX_D3 OPMODE_1 : OPEN

RX_D2 OPMODE_2 : Pull-up to VDDI

LED_1 : AUX_IOVDD

LED_ 2 : AUX_IOVDD

RX_CTRL / MIRROR_EN : Cooper Miror Enable

RX_CLK_LINK_LOSS : Link Loss pas thru Disabled

For The block diagram it design as follow using computer : 

PC 1 ---------------------> Ethernet ---------------------> RJ45 connector DP83869EVM ----------> Media converter ---------------------> SFP cage  + SFP connector Ethernet ----------------->  PC2.

The speed of the ethernet link is set to be align with the 100 Mbps. The PC are windows computer.

Hello Ynouss DIALLO,

Could you please share the capture.png and media_converter.png diagrams.

I understand the RJ45 of the EVM is connected to one of the PC.

To what board does the fiber connector of the EVM connect  before being connected to another PC.

Do you have 2 DP83869 EVMs or 1 ? 

Regards,

Sreenivasa