PHY external loopback test setting

linlin1225 — Wed, 07 Dec 2022 16:11:16 GMT

Dear NXP,

I am using S32K148EVB to prototype a test bench setup, while I have some question related to external loopback test on PHY. I made a board to interact with S32K148EVB via existing Samtec connector like figure below.

I aim to do PHY external loopback test on TJA110 as datasheet mention below with MII mode and compare the transmit eth frame and recev. eth frame.

I use the 4.0.1 SDK example code (enet_loopback) as a start. Add Initialization for PHY and register setting of TJA1100 which are good, however, I couldn't send data to my TJA1100 which I suspect my ENET init config was wrong.

For this test, I only changed .miiMode from ENET_RMII_MODE to ENET_MII_MODE and leave .rxConfig stays same as figure below.

I am wondering is there any suggestion how to initialize the ENET to realize the function I want?

should I also set .rxConfig = 0 and enable something else.?

Best regards

Re: PHY external loopback test setting

PetrS — Thu, 08 Dec 2022 19:36:23 GMT

Hi,

yes, the .rxConfig should be 0 to do not use internal loopback on ENET.

BR, Petr

S32KのトピックRe: PHY external loopback test setting

PHY external loopback test setting

Re: PHY external loopback test setting