AM335x Test RMII connection

Patrick Ruf

Other Parts Discussed in Thread: TLK110, AM3359

Hi,

I have two TLK110 PHY's connected to an AM3359 CPGMAC0 (CPSW) with RMII connection and I'm kind of new to the Ethernet topic. MDIO communication has been tested and works as it should. Now I want to test the RMII connection. Can someone tell me how to test this connection without having to implement a TCP/IP stack in the AM3359?
Is there any mechanism to test this connection (like a loopback test)?

Thanks for the support.

Best regards,
Patrick

over 11 years ago

0 Biser Gatchev-XID over 11 years ago

TI__Guru**** 393215 points

Hi Patrick,

You might want to take a look at the Starterware examples: http://processors.wiki.ti.com/index.php/StarterWare_02.00.01.01_User_Guide#Ethernet

0 Patrick Ruf over 11 years ago in reply to Biser Gatchev-XID

Genius 4965 points

Hi Biser,

Thanks for the input. I have already had a look a those two examples in Starterware. They both base on the lwip TCP/IP Stack. I was wondering if there is an easier solution to test a PHY connection with maybe an internal CPSW mechanism that needs only some register accesses.

Thanks.

BR,
Patrick

0 -DK- over 11 years ago in reply to Patrick Ruf

TI__Mastermind 27890 points

As Biser mentioned, Starterware is ideal for what you are trying to do.

The TLK110 supports several loopback modes as well as a BIST feature that may also be useful here.

You may also want to take a look at the CPSW STATS register set...connecting the DUT to an active network should increment the relevant Rx statistics if the PHY-MAC interface is correctly connected. This solution wouldn't help you verify Tx though...I can't think of a way to do so without driver involvement.

0 michael musset over 10 years ago in reply to -DK-

Expert 1135 points

Hi,

How did you test the RMII/MDIO communication ?

0 -DK- over 10 years ago in reply to michael musset

TI__Mastermind 27890 points

RMII: As above...many (most) PHYs support loopback or some other BIST method.

MDIO: If you'd like to create your own test, you could use the MDIOUSERACCESSn register to R/W directly to the attached PHY. Since the MDIO engine is autonomous on AM335x, you could also just check the status of MACCONTROL for the relevant port. If the values make sense, MDIO is working.

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AM335x Test RMII connection