No SPI response from W5500

Question

I have successfully tested my set up (a PIC MCU development board) with wiz850io board. However, I made my own PCB with the W5500 chip and it is not working with the same set up. Using oscilloscope I monitor all the SPI signals and all seem fine except MISO; MISO is always low. Also I wire LINKLED to an LED and it is always HIGH. I also probe the XI and XO pins and do not see any oscillation, they are always at 0V. Is the crystal not functioning and cause this problem? I use this crystal: ECS-250-10-37BQ-CTN-TR with two 12pF C0G/NP0 capacitors. This is the schematic: image695×183 31.2 KB I have never used crystal. Do I expect to see 25MHz waveform when placing a probe on the IN and OUT pins?

Eugeny · Answer

Putting probes (x10) onto crystal will change the capacity and may distort the waveform you see. But you say you see nothing, and it must not be normal. Check your circuit against reference one. Check layout. Use microscope and inspect the quality of assembly. Ensure there’s no stupid mistake in the nominals of the components used. Ensure proper power provided to the chip’s circuit. Under normal conditions, when you attach live network cable to the device, link LED must turn on (but mind W5500 does not support MDIX).

Eugeny · Answer

If clock is bad nothing will work. The are relatively independent, digital part may work but analog may have problems. Not sure otherwise.

zzwwss · Answer

Hi Vien_Huy_Nguyen I seem to have encountered a problem similar to yours. May I ask if your problem has been resolved? Can you share your experience

zzwwss · Answer

Hi Vien_Huy_Nguyen Thank you very much for your help. Once I pass the debugging, I will share the results of my problem with you