2009-05-27 10:07:20     Question about PJ1 ( MDIO) and having pull up to an 3.3v.

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2009-05-27 10:07:20     Question about PJ1 ( MDIO) and having pull up to an 3.3v.

Pawel Pastuszak (CANADA)

Message: 74651   

 

Hi Guys,

 

 

 

I working on bringup and new custom board that has an BF537 version 1.0.3 and i want to known why the ethernet driver doesn't work if there is an pull up on the MDIO (PJ1) with an 3.32k resistor.

 

 

 

Can any body explain to me why it works if MDIO is left as No Connect/Flotting.

 

 

 

Here is my current setup..

 

PJ0 (MDC) = NC

 

PJ1 (MDIO) = ----- 3k32 --- +3V3.

 

 

 

But if i change it to

 

PJ0 (MDC) = NC

 

PJ1 (MDIO) = NC

 

The every thing works...

 

 

 

The big question is why?

 

 

 

Pawel

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