DP83620: IP Address is not set when link is configured in 100Base-FX mode. It works in 100Base-TX mode. Do we need to change the Mii interface or configuration when we switch from TX to FX mode?

Michael O'Gorman

Part Number: DP83620

Dear TI,

We have a medical device that has a CPU and uses the DP83620 PHY. When operating in 10/100Base-TX the unit takes an IP address from the system and can establish a link without a problem. If we switch to a fiber link, we can get the physical fiber link operating, the electrical signals are all correct. We can see communication on the FX link and it appears that data is being transferred, however, we cannot read an IP address from the CPU. Is there something we need to change in the Mii interface when we boot strap the PHY to 100Base-fx ?

best regards

Michael O'Gorman / Head of Product Development / Firecomms

over 6 years ago

0 Ross Pimentel over 6 years ago

TI__Mastermind 23675 points

Hi Dr. O'Gorman,

Can you share with me the schematic of the DP83620?
There should be no additional strap besides FX setting.

Kind regards,
Ross

0 Michael O'Gorman over 6 years ago in reply to Ross Pimentel

Prodigy 185 points

Hi Ross, Thank you, yes I'd be delighted to send you the schematic. My email is mogorman@firecomms.com If you send me a mail I'll reply with the schematic. /Thank you/Michael

0 Michael O'Gorman over 6 years ago

Prodigy 185 points

Hi Ross, I extracted the PHY section of the schematic here. Hopefully you can view this. / many thanks / Michael

PHY Schematic

PHY schematic FMC.pdf

0 Michael O'Gorman over 6 years ago in reply to Ross Pimentel

Prodigy 185 points

Hi Ross, were you able to see the PHY schematic ?

0 Michael O'Gorman over 6 years ago in reply to Ross Pimentel

Prodigy 185 points

Hi Ross, I uploaded the schematic, are you able to read it? I would appreciate some feedback/ Thanks

Interface

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DP83620: IP Address is not set when link is configured in 100Base-FX mode. It works in 100Base-TX mode. Do we need to change the Mii interface or configuration when we switch from TX to FX mode?