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DP83TC814S-Q1: Configuring SGMII Signal Characteristics

Dhyan Mothukuri
Prodigy 10 points
Part Number: DP83TC814S-Q1

Tool/software:

Hello TI Team,

I'm working with the DP83TC814S PHY and have a question regarding SGMII interface configuration.

For the SGMII interface, I would like to know whether the signal characteristics can be configured

So, please respond to below, 

1. What signal characteristics, if any, can be configured (e.g., internal delay, output drive strength, slew rate, pre-emphasis)?

2. Is there support for SGMII timing adjustment or delay insertion on the DP83TC812 or DP83TC814S? 

3. Are there any application notes or register configuration guides that specifically describe how to tune or verify SGMII signal integrity on these devices?

Thanks

  • 0
    TI__Genius 16790 points

    Hi Dhyan,

    Dhyan Mothukuri said:
    1. What signal characteristics, if any, can be configured (e.g., internal delay, output drive strength, slew rate, pre-emphasis)?

    These electrical characteristics are generally either fixed or automatically controlled. On some of our Ethernet PHYs, the VOD (output swing) can be adjusted but I did not see a mention of this in the TC814 datasheet.

    Dhyan Mothukuri said:
    2. Is there support for SGMII timing adjustment or delay insertion on the DP83TC812 or DP83TC814S? 

    The SGMII registers contain settings for alignment, the auto-negotiation timer, and certain other options but there are no general registers for timing and delay on the TC814. Are you also working with the TC812 in this project or is it a general inquiry?

    Dhyan Mothukuri said:
    3. Are there any application notes or register configuration guides that specifically describe how to tune or verify SGMII signal integrity on these devices?

    Our SGMII troubleshooting guide briefly discusses SGMII signal integrity in section 1.6 in terms of reviewing an eye diagram. The ability of our PHYs to manually tune MAC interface electrical behavior for signal integrity purposes is generally limited, so the emphasis is placed on good layout practices.

    Best,

    Evan Su