AM2634: Configure RMII on AM2634 evaluation board

Hi Vikas,

Rohal said:

I'm working on AM2634 evaluation board, All examples are using RGMII mode but I want use RMII mode only,

Yes, all the out of box SDK examples are configured on RGMII mode.

I will share the steps to change it to RMII by the end of the day

Rohal said:

Basically I have to use AM2634 with DP83822 in RMII in our custom boards, So these information will be helpful to RUN ethernet on our custom boards

To integrate your PHY on custom board, follow the guide: https://e2e.ti.com/support/microcontrollers/arm-based-microcontrollers-group/arm-based-microcontrollers/f/arm-based-microcontrollers-forum/1353799/faq-am2634-integration-of-phy-driver-on-custom-board

Note: This guide is based on DP83TC812 PHY, follow the guide and make changes according to the DP83822 PHY.

Regards,

Shaunak

Thanks for your feed back....

1. please share RMII configuration process

2. All the examples having switch mode and MAC mode also, I want use normal mode Ethernet only 

    So please the process for the same also.

Hi Vikas,

1. The on-board PHYs on AM263x do support RMII but due to Pin limitations RMII and MII is supported on the device (AM263x). On your custom board this limitation would not be the issue and RMII can work. (That is the reason all examples are configured as RGMII).

One question, is it a hard requirement to use RMII in your application? Can RGMII not be used? I am preparing the steps and testing and I will share it as soon as possible (to enable RMII)

2. What exactly do you mean by Normal ethernet mode? Can you please elaborate? 

• Switch Mode - packets forwarding in enabled and packets are forwarded to Host + Other MAC ports. This is the default configuration for CPSW.
• MAC mode - packets are only given to Host port and is not forwarded to Other MAC Ports.

What is the flow expected in normal ethernet mode?

Regards,
Shaunak

thanks for valuable feedback once again

1. As per my understanding AM263x eval board can't be configure to RMII/MII mode.

2. MAC mode only, I don't want to forward ethernet packet on multiple ports or any other port, I want to send packet from AM263x to PC and vice versa. 

Hi Vikas,

1. The AM263x device due to pin limitation does not support RMII/MII. But the on-board PHY does support.

2. One question, is your device the RMII master or RMII slave device?

3. is it a hard requirement to use RMII in your application? Can RGMII not be used?

4. How many ports do you need to use?

Regards,
Shaunak

One question, is your device the RMII master or RMII slave device?

                      Generally we are working on Design, My preference is Slave mode(TCXO will be use and that will be common to Am2634 and PHY) 

is it a hard requirement to use RMII in your application? Can RGMII not be used?

                        Yes, as per product specs it should be RMII only

How many ports do you need to use?

                       we need 3 port for RMII 

I need Activity diagram also for Ethernet, that will be helpful to understand the Stack's work flow 

One more thing i need to know, we are planning to use 3 Ethernet ports so i want to know how to handle 3 port  data on a Lwip stack 

Hi Vikas,

Rohal said:

I need Activity diagram also for Ethernet, that will be helpful to understand the Stack's work flow 

You can refer: https://software-dl.ti.com/mcu-plus-sdk/esd/AM263X/latest/exports/docs/api_guide_am263x/enetlld_top.html

I will discuss internally and revert back to other questions early next week. I would need some time to analyze the requirement.

Regards,

Shaunak

Do we have any examples of dual port and dual IP address assigned?

I want to use AM2634 in such a way that it will get 2 IP address and communicate with 2 different servers.

and how to assign MAC addresses ?

Is MAC address exist in MCU or in Phy it self?

or MAC address is part of firmware only? 

kindly find attached image for 3 port ethernet network connected with 3 servers

I want such application example code which can work on 3 ethernets independently  

Hi Vikas,

There are 3 Ports on the AM263x-CC.

Two of them are interfaced to CPSW and one to ICSS-M. CPSW does support RMII. ICSS-M supports only MII. So the above 3 port RMII system would not be possible on the AM263x.

Regards,

Shaunak

Dear Shaunak,

for 2 PORT CPSW interface do we need common MDIO and MDC signals, because only 1 MDIO and MDC signal available in MCU or PRO_MDIO0_MDC can be configure for CPSW.

As per evaluation board U52 is common and it can be drive by both the Ethernet interface ICSS and CPSW,

So my question is can we drive 2 MAC port ethernet on CPSW with RMII interface by PRO_MDIO/MDC and MDIO/MDC or do we need to multiplex MDIO/MDC to drive 2 MCA port ethernet on CPSW with RMII interface

Hi Vikas,

MDIO signals are common, it is shared for all the PHYs connected to CPSW (2 PHYs here), so no need to multiplex.

You can refer the TI AM263x design Schematics.

Regards,
Shaunak

as per attached image

MDIO/MDC signal shared between U52 and U51 by switch(TMUX154EDGSR), 

I think we also add this switch in our custom board and PRo_MDIO/MDC can't be used for CPSW 

Hi Vikas,

Yes, PRU_MDIO is dedicated for PRU only, we should not use it for CPSW, and same thing applies for CPSW_MDIO.

In the Evaluation board, there is a mux which can select between CPSW_MDIO lines and PRU_MDIO lines that are routed to U52. You can implement same in your custom board.

There are three PHYs U52 -- DP83869, U61 -- DP83869 and U1 -- DP83826. I am referring to AM263x-CC Rev-A schematics. U51 is an AND gate. Please check once the schematics you have. You can find the schematics here TMDSCNCD263 Evaluation board | TI.com

Thanks and Regards,
Narayanarao Puli