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DP83TC811S-Q1: 100base-T1 to 100base-TX conversion with hardware

Kailyn Chen
Genius 9560 points
Part Number: DP83TC811S-Q1
Other Parts Discussed in Thread: DP83TC811EVM

Hello,

I designed the schematic according to the DP83TC811EVM to realize 100BASE-T1 to 100BASE-TX conversion, the hardware configuration are as attached files.

LD2021-PMMS-SYYN-V1.1 .pdf83TC811 configuration.xlsx

If the default circuit could realize the conversion, not through MDC/MIDO port? But the RX_CLK has 2.5MHz output，RX_CLK has no output.

In addition, if the autonomous mode means it may not configure the registers without MSP430?

Best regards

Kailyn 

  • 0
    TI__Genius 17800 points

    Hi Kailyn, 

    I am having trouble understanding the problem. Can you please explain what you mean by "If the default circuit could realize the conversion, not through MDC/MIDO port? But the RX_CLK has 2.5MHz output，RX_CLK has no output."

    Regarding your second question, yes you can operate the device without an MSP430 in autonomous mode. Configuration of the device can be done entirely through bootstraps as described in section 8.5.1 of the datasheet. 

    Thanks,

    David Creger

  • 0 in reply to David Creger
    TI__Genius 9560 points

    Hello David，

    Thank you very much for your reply.

    In autonomous mode without MSP430,does it realizer the 100Base-T1 to 100Base -TX  conversion？

    Best regards

    Kailyn

  • 0 in reply to Kailyn Chen
    TI__Genius 17800 points

    Hi Kaitlyn, 

    Autonomous mode will not affect the conversion, it only affects the link up of the PHY after a power on reset (POR). In autonomous mode, the PHY automatically switches to normal operation after a POR, while in managed mode, it will only transition to normal state by register access (described in section 8.4.11.1).

    Nonetheless, the 100Base-T1 to 100Base-TX conversion can be done without an MSP430, by setting the mode of each PHY through bootstraps. 

    Regards,

    David