AM2432: Ethernet/IP - Two PHYs with different Mac Address

Hi Stefano,

Can you share the SDK version that you're using?

Regards
Archit

Hi,

I am using 11.00.00.08.

Regards

Hi Stefano,

I apologize for the delayed response. As specified in the specification, Vol2-1.34, section 5-5.3.2.3:

"Devices with multiple ports but a single MAC interface (e.g., a device with embedded switch technology) may use the same value for this attribute in each instance of the Ethernet Link Object."

Since the EIP Stack uses embedded switch technology, this applies to your use case as well, meaning your device may operate with just one MAC address.

However, if you want the EIP to report the MAC address from the PHY that isn't handled by the EIP example (custom MAC address), you can easily accomplish this by modifying the array named "EI_APP_TASK_macAddress" in app_task.c.

Additionally, you would need to add the symbol "_DEBUG_USE_CUSTOM_MAC_ADDRESS" to your predefined symbols as shown below:

Best regards,
Pourya

Hi Pourya,

Ok, thank you. 

But how can I manage two different MAC? In this way I can set value of MAC on both PHYs, right? Because I have two different devices and two PHYs.

Laboratory has reported me that as result:

Port 2, which is labeled “****” on the module, uses a different MAC address than port 1. In principle, this would of course be possible. However, in the EthernetLink object, the identical MAC address is specified in attribute 3 for both instances.

Regards.

Stefano

Hi Stefano,

I believe you were using an incorrect MAC address; specifically the hidden intermediate PHY address between the second port and the third PHY that's externally exposed, if I recall your project details correctly. Please follow the instructions I provided earlier (use the MAC address of the 3rd PHY since it's the exposed one) and then try again to see if this resolves your issue.

On the TI AM243x-LP, when you run the example and read Attribute 3 from both Port 1 and Port 2, you'll notice that the MAC address is identical in both cases. More importantly, the MAC address visible in Wireshark matches this same address.

For your information: The EIP Stack/Example implements the "Device with Multiple Ethernet interfaces and a single IP Address and CIP Interface" topology, as described in Vol2-1.34, Section 6-3.4.

Best regards,
Pourya

Hi Pourya,

Just for clear. 

Do I use EI_APP_TASK_macAddress array or other structrure as mandatory?

Because in the example I see that 

// Set MAC address of module
OSAL_MEMORY_memcpy(tParam.ai8uMacAddr, EI_APP_TASK_macAddress, 6);

And in EI_APP_TASK_macAddress if define is enabled one Mac Address is copied in the buffer.

Where am I wrong?

Hi Stefano,

Yes, you should set the content of EI_APP_TASK_macAddress  with the MAC address of the exposed PHY (the TJA1101B). This approach supports the goal of maintaining a single unified MAC address across all ports in your system.

Best regards,
Pourya

Hi Pourya,

No, my goal is to have 2 different mac for the two interface. Because port reached by TJA1101 is on another device with another MAC. 

So, is it possible set one mac for RJ45 port (phy 83826e) and one mac for phy TJA1101?

Generally, I'd like to set different MAC.

Regards

Hi Stefano,

I was away for a few days, sorry for delayed response.
No, it is not possible to set two different MAC address for different ports. Because as mentioned before, the following topology is supported on Standard SDK:

Pourya Eskandari said:

"Device with Multiple Ethernet interfaces and a single IP Address and CIP Interface" topology, as described in Vol2-1.34, Section 6-3.4.

Pourya Eskandari said:

Vol2-1.34, section 5-5.3.2.3:

"Devices with multiple ports but a single MAC interface (e.g., a device with embedded switch technology) may use the same value for this attribute in each instance of the Ethernet Link Object."

That's why I was suggesting using one unified MAC address for your device.

Best regards,
Pourya