DP83849I: monitoring register values in dp83849ifvs

Hi Tex,

Could you please send a schematic of your design? This could be a case of incorrect polarity.

Regarding registers access, DP83849 has registers 0x0-0x1F available so they should be accessible via direct access.

Sincerely,

Gerome

Thanks for your reply Gerome Cacho,

Please find the above attached images for your reference and please guide me to achieve the ether detection 

If the controller pin names are not visible please take reference of DP83849IFVS-EVK schematic

NOTE: While i try to monitor ethernet signals observed that from TX pins 60Mhz clk is coming while the RX pins has no signal.. here no signal should be coming from the RJ-45 pins..

Best regards,

tex

Hi Tex,

I am trying to unpack a few things from your latest reply;

1) Which LED is showing "incorrect" polarity?

2) Are you seeing link/communication issues too?

3) Which RX pin are you seeing no signal? Does PHY have link at this time?

4) What MAC interface is PHY in?

4) There shouldn't be 60MHz signal coming in

Sincerely,

Gerome

Hi Gerome,

1) there is no incorrect polarity in LED but I Observed Max/high intensity.. while the same LED which is used as FX_Link LED is working as expected..

2) Yes! I'm facing issues with the Link/Communication issues.. when i connect it to the system the ethernet is not detecting

3) At ethernet pins RDP_A & RDM_A.. from those pins i see no signal.. 

4) could you please elaborate this 4th point with procedure.. how can i see the PHY in which MAC interface it is in.. when i try to find PHY form USB2MDIO it is showing all PHYs NOT AVAILABLE.. when i try to make script and open in USB2MDIO application it is showing no device is connected..

5) Yes it shouldn't come 60Mhz.. i also see some other link partners to know more about the ethernet signals..

also i have doubt on MDIX_EN pin(pin no 2) should i enable it to achieve Media convertion? 

i made a ethernet crossover cable and checked if the polarity might be reverse but still the same Ethernet is not detected..

Please ask if any further info is required..

Regards,

Tex

Hi Tex,

The RDP pins are the MDI pins and are inputs to the PHY from the link partner. I am more talking more from the RMII RX side as these are outputs of the PHY.

The MAC interface is the connection between PHY and MAC. This is more of a design choice by user; whether the interface is MII, RMII.

You state that you are using USB2MDIO to check the PHY's registers. What is the connection between the launchpad and PHY? What FW is the launchpad using?

If you are trying to utilize media conversion, please utilize this app note.

For MDIX_EN, this is to enable Auto-MDIX mode which is helpful for CU side.

Sincerely,

Gerome