• State Resolved
  • Locked Locked
  • Replies 2 replies
  • Subscribers 34 subscribers
  • Views 665 views
  • Users 0 members are here
Support feedback
Options
Options
Related

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

DP83867IS: what is the length of the PHY address

Roger Hickey57
Prodigy 220 points

Part Number: DP83867IS

We are using a Xilinx VCU118 development board.

The board uses a DP83867ISRGZ PHY in SGMII mode.  We are having problems getting the PHY chip to respond.

We have checked the phy address is strapped to address  0 0011 . We send a command to read address 0x0003.  We use a 5 bit PHY address.  The waveforms are consistent with figure 17 in the data sheet:

Elsewhere in the data sheet it mentions that 16 PHY addresses are supported and table 3 shows a bit PHY address <AAAA>.

How many bits are in the PHY address for this part? 

Thanks,

Roger 

  • 0
    TI__Mastermind 18425 points

    Hi Roger,

    On the PHY, we only have 4 bits for register address straps. However, 5 bits need to be used when communicating over MDIO-MDC pins. The highest significant bit will always be '0' i.e. 0 0000 to 0 1111. Can you try read other PHY address?

    -Regards

    Aniruddha

  • 0 in reply to Aniruddha Khadye
    Prodigy 220 points

    Aniruddha,

    Thanks for the response.  We tried cycling through all of the PHY addresses and it appeared to work at PHY address 0 1111.  Thanks for the help!

    Our manual review of the boot strapping on the board showed that  RX_D2 = Strap Mode 1 and RX_D0 = Strap Mode 4.  go figure