SJA1105TEL TX Data Problem

mcagriaksoy — Wed, 21 Feb 2024 14:53:40 GMT

Hello,

Summary: I am using #SJA1105TEL switch with #88E1512 PHY. I am developing the basic Ethernet switch device. I have successfully connected the PHY and switch module and I can see the data on Rx side of switch (Read N_RX_BYTES register for diagnose) But somehow I cannot see any Tx data on N_TX_BYTES diagnostic register.

My configuration: 1GBit, RGMII. I have used the script(s) which I attached for static configuration. (I have tried many different configuration scripts to be sure the problem is not caused by my config file)

Then I also configured the Clock Generation Unit (CGU) and Auxiliary configuration Unit (ACU) as following:

So, the ACU and CGU is also valid! Then, I connected the devices on ports and start testing.

After device connection on various ethernet ports, the link is UP, and data exchange start but,

when I read the diagnostic registers like "N_RX_BYTES", "N_TX_BYTES" I can see the N_RX_BYTES returns incrementing values as expected. But N_TX_BYTES is always zero or some constant value.

I also read the error diagnose values like, "N_RUNT", "N_SOFERR", "N_ALIGNERR", "N_MIIERR" but I these are zero, so the switch cannot catch any error on link.

Tests I made:

- Check the clock(s) (with Oscilloscope) have observed 125Mhz on both side (mac <--> phy) PASS!

- Check the confirm register () that informs, the static confirmation is valid! PASS!

- Check the status registers like speed, device mode, link status are valid! PASS!

- Check the N_RX_BYTES that increase? PASS!

- Check the N_TX_BYTES that increase? FAIL!

- Check error diagnose registers is clear? PASS!

Which things can be problematic?

I have no host in my configuration. I am implementing the basic switch and I do not have the host_port defined. I just want to pass data between ethernet ports. So, I guess my static config file should be quite simple

Question 1? Should I really use the HOST_PORT option, is it really required in my case?

Question 2? Why I cannot see and data on TX side of switch?

Question 3? I am not sure is it really caused by Phy or Switch but Switch RX register has some data and Tx has nothing. I seems to me, the data is eliminated. Do we know why It happens?

Is it caused by wrong configuration file inclues wrong MAC_FLTRES and MAC_FLT values? (To be sure, I tried many different MAC possibilities including multicast addresses and so on.)

Thank you for your response and time..

Re: SJA1105TEL TX Data Problem

mcagriaksoy — Thu, 22 Feb 2024 15:18:01 GMT

I resolved that problem. It caused by the missing reset in beginning. Before the uploading static config I have called the "Reset Generation Unit (RGU)" RGU register with cold reset mode and my problem is resolved.

topic SJA1105TEL TX Data Problem in Other NXP Products

SJA1105TEL TX Data Problem

Re: SJA1105TEL TX Data Problem