TMS320F28388D: 28388D EtherCAT

Xijun, 

We are looking into this and will get back to you.

Thanks.

Hi Xijun,

Xijun Ni said:

So can i use two GPIOs as the transmit-0 and transmit-1‘s clock and data independently?

No, both PHYs should share the same MDIO Data and Clock signals. The signals are MUX'd onto different device pins, but they are still the same signals.

Best,

Kevin

Hi Kevin,

    The signals are MUX'd onto different device pins, so can i  define MDIO Data to  GPIO 152 and GPIO 26 simultaneously? Of cousre, i need to spend two pins. As same as clock signal, thank you.

Hi Xijun,

Yes, this should be possible, but it isn't the typical usage. The signals would then basically be shorted internally. Nothing from the GPIO MUX side would block this configuration it seems.

Do you have TMDSCNCD28388D board to quickly test this with?

Best,

Kevin

Hi Kevin,

      I don't have any demo board, just for a new PCB design.

Hi Xijun,

OK, I may be able to test this later this week. I'll need to get back to you later on this.

Can I ask why you're wanting to bring this same EtherCAT signal to two device pins?

Best,

Kevin

Hi Kevin,

     In order to limit the core system board area, i just needs one EtherCAT input, so if there are new demands on the expand board, i can add the EtherCAT output by the other pins.

Hi Kevin,

    Any conclusions？ Thanks.