agwells
Newbie level 1
PIC18F87J60 PHY problem
I have an embedded controller board based on the 18F87J60, using FreeRTOS, Microchip TCP/IP stack V5.10, the development uses MPLAB V8.3 with an ICD3 and Microchip C18 V3.31.
The board is fully operational apart from the Ethernet module, I know the software works as I have run the software on a PICDEM.net2 board and the TCP/IP functions correctly.
The problem is that the PHY does not seem to be running, the TPOUT pins are sitting at around 0V and no Link Test Pulse is generated, nor does the receive side see the LTPs from the attached hub and turn on the link LED. I have checked all of the individual power pins and they are all solid at 3.27V. It is obvious that I have made an error somewhere but I can not work out which part of the circuit/layout can stop the PHY running. I have compared the voltages on my board with the demo board and the only obvious differences are the TPOUT levels.
If anyone has any ideas at all of where I should look next I would appreciate your help.
I have an embedded controller board based on the 18F87J60, using FreeRTOS, Microchip TCP/IP stack V5.10, the development uses MPLAB V8.3 with an ICD3 and Microchip C18 V3.31.
The board is fully operational apart from the Ethernet module, I know the software works as I have run the software on a PICDEM.net2 board and the TCP/IP functions correctly.
The problem is that the PHY does not seem to be running, the TPOUT pins are sitting at around 0V and no Link Test Pulse is generated, nor does the receive side see the LTPs from the attached hub and turn on the link LED. I have checked all of the individual power pins and they are all solid at 3.27V. It is obvious that I have made an error somewhere but I can not work out which part of the circuit/layout can stop the PHY running. I have compared the voltages on my board with the demo board and the only obvious differences are the TPOUT levels.
If anyone has any ideas at all of where I should look next I would appreciate your help.
