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