DP83867E: Strap Configuration Status Register (0x6e) reset?

Hi Ella,

Upon every hardware reset, the strap register should re-load the values based on what is observed from the straps. For example, if a hardware change is made to the bootstrap registers during normal operation, and then the PHY is reset, you may see a change in register 0x6e reflecting the hardware change to the bootstraps (though as you can imagine, this method of hardware change during normal operation is not recommended). 

I have the following questions:

• Can you kindly share a schematic for review?
• Do the strap resistors for the desired modes match the recommended values?
• What is the voltage on each strap pin during the strap latch-in period? Does it match the expected voltage for the desired strap mode?
• Is there a connected device on the strap pins that could possibly be pulling them low?

Thank you,

Nikhil

All information in this correspondence and in any related correspondence is provided “as is” and “with all faults”, and it is subject to TI’s Important Notice (http://www.ti.com/corp/docs/legal/important-notice.shtml).

Hi Ella,

Are you still experiencing this issue? Do you have any feedback for my questions above?

Thank you,

Nikhil

All information in this correspondence and in any related correspondence is provided “as is” and “with all faults”, and it is subject to TI’s Important Notice (http://www.ti.com/corp/docs/legal/important-notice.shtml).

Hi Nikhil Menon, I cannot send you a private message, I can only reply to you here, please help me solve the podl

Hi Zeshan,

I have sent you a private message. Please let me know if you do not see the message.

Thank you,

Nikhil

All information in this correspondence and in any related correspondence is provided “as is” and “with all faults”, and it is subject to TI’s Important Notice (http://www.ti.com/corp/docs/legal/important-notice.shtml).

Hi Nikhil, 

Thank you for your follow-up. For your question 1 and 2, I provided schematics thru the email and we discussed enough to get a conclusion that the schematic has no issue. For your question 4, strap pins are directly pulled up to LDO power supply without other devices. 

I asked customer to check strap pin voltage and register values (0x0, 0x1, 0x10, 0x11, 0x14, 0x31, 0x32, 0x37, 0x6e) for debugging but I haven't heard any feedback yet. Maybe you can close this thread and I can ask for your help again thru email once I get feedback from customer.