TMS570LC4357: MII and RMII design with LWIP

Sameer Thakur

Part Number: TMS570LC4357
Other Parts Discussed in Thread: HALCOGEN

Hello,

I've developed an application that receives the data over Ethernet and transmits the received data over Ethernet. The base application for my this development is LWIP and the code works fine. Upon checking the HALCoGen Project for this, I could find that the Ethernet interface is MII.

The query is, while I tried changing the interface from MII to RMII, the same code did not work! How do I get RMII working? Do I need to make and Hardware and / or software changes for this?

BR,

Sameer

over 2 years ago

0 jagadish gundavarapu over 2 years ago

TI__Guru 57320 points

Hi Sameer,

I am working on your issue and i will get back to you soon with an update.

Thanks & Regards,

Jagadish.

0 Sameer Thakur over 2 years ago in reply to jagadish gundavarapu

Prodigy 70 points

Hi Jagadish,

Could you look into this?

0 jagadish gundavarapu over 2 years ago in reply to Sameer Thakur

TI__Guru 57320 points

Hi Sameer,

There are couple of hardware changes required at phyter IC to use RMII interface

1. RX_DV pin of the phyter should be pulled high.

2. By default x1 pin of the phyter may connect to 25Mhz clock to operate in MII mode and it should be connected to 50Mhz to operate in RMII mode

After doing above hardware changes, please also make sure to enable MDCLK and MDIO pins because they are not enabled automatically by HALCoGen and have to enable manually

Thanks & Regards,

Jagadish.

0 Sameer Thakur over 2 years ago in reply to jagadish gundavarapu

Prodigy 70 points

Hi Jagdish,

So, is it possible to bring such hardware changes into https://www.ti.com/tool/TMDX570LC43HDK?keyMatch=TMS570LC43X%20HERCULES%20DEVELOPMENT%20KIT ?

Regards,

Sameer.

0 jagadish gundavarapu over 2 years ago in reply to Sameer Thakur

TI__Guru 57320 points

Hi Sameer,

It is possible

1. Populate R193 resistor (2.2kohms) to pull RX_DV up

2. Replace Y3 with a 50-MHz oscillator

Thanks & Regards,

Jagadish.

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TMS570LC4357: MII and RMII design with LWIP