DP83867ERGZ-S-EVM: Where can I probe a signal 100M (Clock and Data)

Hi Sven,

You should be able to place the prongs of your diff probe on the SGMII AC coupling capacitors between the PHY and the SMA's:

In my experience its difficult to discern anything from the data on SGMII lines, however you should be able to see a signal. If using one board you'd only see a signal on the SGMII transmit path. If you connect both boards together you should see a signal on both transmit and receive paths.

I believe this board would have the device in 4-wire SGMII by default, which does not use the clock lines. If you want to enable the SGMII clock, use the following register shown in the datasheet:

Best,

Shane

Hi Shane,

thank you for the quick replay. I want to check the 100baseT signal. Is that possible? If yes, where are the connectors?

Br,

Sven

How do I disable gigabit advertisement of the EVM? With the MSP430F5 Series LaunchPad? Or is there another way?

To disable gigabit advertisement, use register 0x0000[13:12] and 0x0000[6] to force 100Mbps speed:

In this case you would write 0 to bit 12, 1 to bit 13, and 0 to bit 6. We typically do this with an MSP430 launchpad connected to a PC running USB2MDIO.

Best,

Shane

Can you please share the link where I can order the equipment (MSP430)? Is it the msp430f5 launchpad? What else do I need?

Here is the link for the MSP430 launchpad we use. You will also need a PC with:

• Uniflash: To flash the launchpad for use with USB2MDIO
• USB2MDIO: This allows the PC to communicate with the launchpad for MDIO/MDC commands.

For more details on how to setup USB2MDIO please consult this bring up guide: 6523.How to flash MSP430 Launchpad for USB2MDIO compatibility.pptx

This E2E may help as well.

Best,

Shane