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DP83TG720R-Q1: PHY communicate function

Chuqiang Wen
Expert 5845 points
Part Number: DP83TG720R-Q1

Hi expert, 

Customer is using DP83TG720R-Q1 and have questions below. Please kindly help on this.

As below block diagram, SMI interface configuration not ready now. In this condition that SMI not connect, whether we can achieve PHY's communicate function(like communicate with external device and transfer data) or not? If not, what is the function it can achieve with external device? 

Thanks!

Ethan Wen

  • 0
    TI__Genius 16030 points

    Ethan,

    SMI configuration is required only to load the optimized register configuration. Without that also PHY can be made to boot up in the required mode and it will link-up fine with the link-partner over the cable. Data transfer tests can be done.

    Also if required, customer can control SMI from external controller board : launchpad.

    --

    Regards,

    Vikram

  • 0 in reply to Vikram Sharma
    TI__Expert 5845 points

    Hi Vikram,

    Vikram Sharma said:
    SMI configuration is required only to load the optimized register configuration.

    How to understand the optimized register? Are you saying that the SMI is only required by register configuration? 

    Vikram Sharma said:
    Data transfer tests can be done.

    So does it means data transfer function can work normal without SMI?

    Vikram Sharma said:
    Also if required, customer can control SMI from external controller board : launchpad.

    If customer use launchpad to config 720 registers through SMI, does the previous configuration in 720 will be lost after 720 power reset?

    Thanks!

    Ethan Wen

  • 0 in reply to Chuqiang Wen
    TI__Genius 16030 points

    Yes SMI is only required for register configuration.

    Data transfer can work normaly without register configuration if the requried mode of PHY is selected through pin straps.

    Programmed registers will get reset to default value if board is powered off and powered on again.

    --

    Regards,

    Vikram

  • 0 in reply to Vikram Sharma
    TI__Expert 5845 points

    Hi Vikram,

    I have questions about how to enter normal mode. 

    From datasheet, power on will enter reset PHY disable → set RESET_N=High and POR complete will enter standby mode → If autonomous enable, standby mode will automatically enter Normal mode. 

    My questions:

    • What is POR? 
    • How to enable autonomous? Is it default?

    Thanks!

    Ethan Wen

  • +1 in reply to Chuqiang Wen
    TI__Genius 16030 points

    POR is the internal power-up reset and is not visible to external world. Customer can just follow the power up sequence timing dictated in datasheet and need not worry about the POR.

    Autonomous mode is enabled by default. (no strap on led_1).

    So by default chip will power up in normal mode.

    For further quieries on different topics from the original kindly open a new thread so that it can be used better for tracking and reference by others.

    --

    Regards,

    Vikram