DP83TG720S-Q1: Failed to configure DP83TG720S in slave mode

Hi Albert,

Register 0x45D only has information related to the straps latched. This bit indicates that the device is strapped to Master using 2.49K resistor on LED_0.

If you want to read the registers to know the current configuration of Master/Slave, please read register 0x834 of MMD01 space.

--
Regards,
Gokul.

hello Koraganji

Thank you for your support, you mean that I have actually successfully configured the phy as slave mode, but 0x45D cannot indicate the master-slave mode, and the 0x834 register is needed to indicate what mode the actual current phy indicates. I'll try again

Hi Albert,

Yes, you are correct. 0x45D doesn't show you the current Master/Slave status. Register0x834 of MMD1 gives you that status.

--
Regards,
Gokul.

hello Koraganji

Unfortunately, I configured the two machines as master and slave respectively, but they failed to link. I'm guessing the machine is still not successfully configured as slave mode。

Regarding the configuration of the slave mode, I strictly follow the manual, as shown in the screenshot below, and after the configuration is complete, I read back the 0x834 register to make sure its value is 0x8001, and help to check my configuration, thank you very much

Hi Albert,

Can you please check if the register programmed is in the space MMD01?

Also, for the slave device, you can disconnect the device and measure the MDI differential signal. If the device is in slave mode, then the differential signal measured on the slave device will be 0V.

--
Regards,
Gokul.

hello Koraganji

I have found the problem. I have a wrong register configuration. Now the two devices can communicate. Please help to close this problem. Thank you very much for your support.