Hi,
We have interfaced a Realtek NE200 clone (RTL8019AS) with a microchip PIC18F452. Our hardware has been mostly copied from the Microchip PICDEM.net board, and we are using the Microchip stack.
However we are facing a strange problem. We are not able to communicate with the NIC. If we request the MAC Address, for example, we get 10:30:50:70:90:b0 instead of 12:34:56:78:9a:bc.. ie the second nibble of every byte is always zero. We are using the NIC in 8-bit mode.
Could it be a problem of soldering? - we have two identical boards showing this same problem... Or could it be due to the oscillator being too close to the data lines? We are absolutely perplexed.. can anybody suggest ways to debug such problems?
Our layouts can be accessed at
Any help will be highly appreciated!! Thanks, Nikhil Patil