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Original question:

DP83TG720EVM-MC: About the strap function of SPE PHY (DP83TG720RWRHARQ1),AND MCU: How to program with DP83867 and DP83TG720...

DP83TG720EVM-MC: "Can you teach us how to measure the SPE signal?"

JIM SHEN
Prodigy 70 points
Part Number: DP83TG720EVM-MC
Other Parts Discussed in Thread: DP83TG720S-Q1

Tool/software:

hi Ti Team

"I am currently using the evaluation board 'DP83TG720EVM-MC'."

"I followed the connection below and sent the register commands, but I still couldn't generate a waveform."

for DP8386x on how to perform Ethernet compliance testing:
https://www.ti.com/lit/an/snla239c/snla239c.pdf?ts=1739988198375&ref_url=https%253A%252F%252Fwww.ti.com%252Fproduct%252FDP83867E

For DP83TG720, please refer to the Testing PMA (Section 4) in the below appnote:

https://www.ti.com/lit/an/snla371b/snla371b.pdf?ts=1739988546562&ref_url=https%253A%252F%252Fwww.ti.com%252Fproduct%252FDP83TG720S-Q1

Can you teach me how to send commands to measure the SPE signal?

  • 0
    TI__Expert 7576 points

    Hi Jim,

    You will need to write to the specific register space for this MMD: 0x01. In the GUI, disable the extended register space. Here is the PMA script for Test_Mode_2:

    Test_Mode_2.txt
    Fullscreen
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    begin
    000D 0001
    000E 0904
    000D 4001
    000E 4000
    end
    XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX

    Best Regards,

    Nick

  • 0 in reply to Nick Peabody
    Prodigy 70 points

    Hi, Nick,

    Sorry for the late reply.
    Test_Mode_2 --> OK.
    I got the waveform for MODE1, but it's not the one I want. The waveform I want should be as shown in Figure 1.
    Do you have the waveform for MODE1?

    MODE1 has more test items for the LAN signal.

    Figure1.

    The waveform shown below is for MODE1, but it is not the one I want.

    mode2-->ok 

  • 0 in reply to JIM SHEN
    TI__Expert 7576 points

    Hi Jim,

    Test mode 1 for the DP8386X will look different than for the TG720. You should see Tx_Tclk 125MHz on CLKOUT pin for PMA compliance test mode 1.

    See section 4 in the DP83TG720S-Q1: Configuring for Open Alliance Specification Compliance (Rev. B).

    Best,

    Nick

  • 0 in reply to Nick Peabody
    Prodigy 70 points

    Hi, Nick,

    Let me explain first
    Our company can measure standard RJ45 LAN signals of 1G and above. The software test conditions are as shown in the attachment (we have both the required instruments and probe software).

    Now, I need to measure SPE signals. How can I perform the measurements in a similar way to what is shown in the attachment? What else do I need to prepare?  Is there an SOP?

    LAN1_PairA.pdf

  • 0 in reply to JIM SHEN
    TI__Expert 7576 points

    Hi Jim,

    We found this https://download.tek.com/datasheet/TekExpress-Automotive-Ethernet-1000BASE-T1-100BASE-T1-MSO6-Datasheet-61W614083.pdf from Tek that has instructions for doing ethernet compliance.

    Best regards,

    Nick