Loopback modes with TJA1100 Issue

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Loopback modes with TJA1100 Issue

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ahmedsaber
Contributor I

Hello All,

In an Automotive project we are using TJA1100 as a PHY, I'm trying to validate the functionality of the 100BASE-T1 PCS and PMA functions.

So according to the TJA1100's datasheet in the loopback section,

pastedImage_1.png

I followed the steps to put the PHY in the external loopback mode as mentioned in the application notes AN12088

 pastedImage_2.png

But when I put the PHY in the external loopback I sent the data successfully but I didn't receive anything

To validate the loopback at all I tried the internal loopback mode, it works fine as Tx and Rx but also there was an issue which is the data transmitted on the bus, while it must not

Any answer please

Thanks

Ahmed Saber

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misonyo
Contributor I

hello ,can you tell me what's the problem you meet? how to solve this problem??

i meet the same problem like you.

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Bulat
NXP TechSupport
NXP TechSupport

Can you describe how you run external loopback test step by step?
What is TRX pins connection during the test?

Regards,

Bulat

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misonyo
Contributor I
Spoiler
 

hello,should I connect TRX PINS to other PHYs?  I meet the same problem when i use TJA1101.

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