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DP83867E: DP83867ERGZT

Part Number: DP83867E
Other Parts Discussed in Thread: DP83TG720S-Q1,

Hi Team,

TI IC part: DP83867ERGZT used in our design and RGMII & SGMII schematic files are available n below link FYR. Please go through it once and let us know if any modification to b done.

https://ufile.io/f/vyq71

Regard's

Raghavendra M

+91-8197296601

  • Hi Raghavendra,

    I'm having trouble accessing this site. Can you kindly provide schematics as PDF attachments?

    Thank you,

    Nikhil

  • Hi Nikhil,

    I have sent  the converted pdf schematic on your mail in behalf of our customer. Kindly check again if you have receive. 

    Thanks and best regards,

    Jonathan

  • Hi Jonathan,

    I have received the schematic via email. I will review and provide feedback by Tuesday of next week.

    Thank you,

    Nikhil

  • Hi Jonathan,

    I have replied yesterday via the customer support case created offline. Please let me know if you did not receive my feedback. 

    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 the response. I have been updating the response of our customer via the customer support case created offline. Kindly check once again and we are looking forward to your response. 

    Best regards,

    Jonathan

  • Hi Jonathan,

    Thanks for the update. I will provide a response with feedback as soon as possible. As we have taken this discussion offline, I will now close this thread.

    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,

    This mail with reference to previous ticket no.: CS0455461. Please respond to following quires at the earliest to release the board for fabrication.

    As per the inputs your given, Pullup and Pulldown on CLK and SGMII_SOP&N are implemented based on the reference board schematic from TI.

     It is recommended to use for the CLK and SGMII_SO signals for Strap Configuration, so it is mandatory to have pullup and pulldown option.

     Main concern is to ask why we need?  Which specific configuration that is recommended?  Is there any negative impact due to stubs and how to assess the impact and counter action to mitigate that? 

     As I requested in the previous mail we need SGMII Tx and Rx eye mask specification details for Signal Integrity analysis purpose. Kindly share the eye mask diagram and AC Timing Specifications.

    1. SGMII transmitter output compliance mask eye diagram and AC Timing Specifications.
    2. SGMII receiver input compliance mask eye diagram and AC Timing Specifications.

    Attached schematic FYR.

    Regard's

    Raghavendra

  • Hello Jonathan Navor & Nikhil,

     

    Refer TI PHY IC Part number : DP83TG720S-Q1 datasheet and page no. 52 Sgmii PHY Receiver Mask Requirement given and we are expecting the same in DP83867ERGZT SGMII PHY chip.

    For SI analysis purpose we can use the same details mentioned in DP83TG720S-Q1 for DP83867ERGZT? Confirm at the earliest.

    Attached Sgmii PHY Receiver Mask image FYR.

    Regard’s

    Raghavendra M

  • Hi Raghavendra,

    I am looking into SGMII TX and RX eye mask diagram. Will provide an update by Tuesday of next week.

    Stubs in the trace path can cause unwanted reflections in the signal. Please refer to Layout guidelines section in datasheet for additional info.

    In regards to your question “It is recommended to use for the CLK and SGMII_SO signals for Strap Configuration, so it is mandatory to have pullup and pulldown option.” Please review Section 8.5.4 in the datasheet. Dummy strap are required for SGMII to balance the load on the differential pairs. My previous question was in regards to the pull placed on TX_CTRL. Is there a need for this, TX_CTRL is not a strap and already has an internal pull-down?

    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,

    Regarding Strap pins on SGMII Lines.

     

    RX_D0 and RX_D2 Pins are used for PHY ID Configuration:

     

    We have a single PHY device connected for MDC/MDIO Line which mean multiple phy ID configurations are not required.

     

    Removing of  pullup and pull down on RX_D0 and RX_D2 Pins will not effect any functionality of PHY and PHY ID will be 0x0000.

     

    Also it help us to avoid the stubs on SGMII Lines.

  • Hi Raghavendra,

    Removing PHY ID straps will be ok. Also, I have confirmed with my team that SGMII mask will be same in DP83867E as in the DP83TD720 example you have shown. 

    In regards to your question “It is recommended to use for the CLK and SGMII_SO signals for Strap Configuration, so it is mandatory to have pullup and pulldown option.” Please review Section 8.5.4 in the datasheet. Dummy strap are required for SGMII to balance the load on the differential pairs. My previous question was in regards to the pull placed on TX_CTRL. Was there a previous recommendation made for this? TX_CTRL is not a strap and already has an internal pull-down.

    Thank you,

    Nikhil Menon

    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 Raghavendra,

    If there are no further questions for this query, I will be closing this thread.

    Thank you,

    Nikhil Menon

    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).

  • Hello Nikhil Menon,

    Thanks for your support, please close the ticket.

    Regard's

    Raghavendra M