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Original question:

DP83848K: Ethernet Conformance Test for DP83848K

DP83848K: USB-2-MDIO Software Tool TO DP83848 Read/write data failure

Chen Shengyang
Prodigy 20 points
Part Number: DP83848K
Other Parts Discussed in Thread: USB-2-MDIO

Tool/software:

Hello expert,

I recently used USB-2-MDIO Software Tool to write specific values to the register of PHY chip DP83848. I have connected MSP430G2 LaunchPad to PHY chip, and then wrote 0x2100 data to register 0x00. After reading the value of register 0x00, it shows that it is 0x0000, for some reason, the write failed. I checked the reset pin. It's high. Ask this how to solve this problem.

https://e2e.ti.com/support/interface-group/interface/f/interface-forum/1445409/dp83848k-ethernet-conformance-test-for-dp83848k/5543315#5543315 

About this.

I use two methods, one is to write the data directly, and the other is to write it through a script.

  • 0
    TI__Expert 6605 points

    Hi Chen, 

    Before trying register writes, I think we should make sure that the MDIO connection to the PHY is good. registers 0x2 and 0x3 have a unique PHY identifier which can be read to make sure that the connection is good. 

    I also would double check that the PHY address being used is correct, that the MDIO/MDC lines are being routed to the correct pins, and that the "Extended register" access is set to "no".

    Best,

    Vivaan