- Ask a related questionWhat is a related question?A related question is a question created from another question. When the related question is created, it will be automatically linked to the original question.
Hi experts,
I am debugging my board which selects the chip AM2432 and DP83822 PHYs.
The eip stack in use is ind_comms_sdk_am243x_09_00_00_03 and I have not change the PHY driver code greatly.
And this is the uart logs:
My question is how to make the two DP83822 PHYs work normally.
From the logs,can we find the problem takes place?What is the next step I should take?
Thank you.
Hi Nilabh,
I found the EIP stack's syscfg not including pins like RX_ER,RX_LINK.Does it mean that RX_ER,RX_LINK can be not used in MII?
If not,why it shows like that?
Besides,when the initial code has been excuted completedly,AM2432 could not output 25MHz frequency which should be used by PHYs.I tested the pin A18(EXT_REFCLK1) and did not find the 25MHz.
The PHYs cannot work normally still.
Could tell me the reason for it?Thanks.
As update, the ICSS MDIO register is read to confirm PHY address and link-up, below are screenshot of the registers, the bit 3 (0x00000008)and bit15 (0x00008000)is toggling with cable connection/disconnections.
The PHY address (3 and 15) is aligned with ones in syscfg
Hi,
I have followed you advice and disabled the manual mode.
And some changes happened in the addr 0x300B2408.
as is shown below:
However,there is no changes about EIP in the logs.
The DUT is connected to pc via a RJ45 cable directly.
I tried the ping cmd and it showd that most or all of packets are lost.
Hi Nilabh,
So far, the schematic has not found any critical issue, the only issue found is on the magnetic side and is fixed, but the problem remains. We are now testing with the loopback example, and it fails too. The loopback cannot receive packets and stuck at waiting.
As we check the PRG register, we see only one frame is transferred.
Also, we are not seeing signals on TD[0-3] pins, and only saw a 121 ms pulse, which is not normal.
Could you help looking into the loopback example too?
Regards,
Hang.
Cusotmer has corrected some configs in the syscfg, as an update to the status, they can see waveforms on RD[3] pin when running EIP stack, but still no waveform TD[0-3] pin. Below is the TX and RX registers
Hi Prajith,
Sorry forget to update this thread, the original issue which is EIP connection failure is solved. So we don't need to test the loopback example anymore.
Though EIP stack is working normally now, we still not understand the root cause of the issue, could you help explain the following behavior?
When we run the EIP stack and use the host PC the ping the device, we didn't see any response in the ping. As we probe the signals in the meantime, we picked up signals on port0 (0 is the port above,1 is the port below) RX and port1 TX, but no signals on port0 TX, as shown in the picture. RJ45-A is connected to the host, and the red frame marks where we picked up signals.
This looks like the am243x is responding the ping at the wrong port. It should respond on port0 instead on port1.
After switching the PHY address (address is 3 and 15, we switched it to 15 and 3)in syscfg, everything works fine, the ping, and the EIP stack.
We don't understand why am243x is responding the ping in the wrong port in the first place, and also don't under stand how PHY address is affecting the port selections, we thought these addresses are just for the MDIO interfaces.
Could you help us understand this?
Thanks,
Hang.
