Hi @krugdu
The SPI pins 11, 12, and 13 are the SPI pins on the Mega, but by default, it is the PWM pin.
So you can’t through the SPI pins 11, 12, and 13 communicate with the shield directly.
What’s more, the SPI pins 50,51,52 and ICSP SPI pins are connected together,
By default, the MOSI, SCK, and MISO PAD of the w5500 shield is soldered to the SPI near the SD direction. At this time, the W5500 communicates with MEGA through the ICSP of MEGA.
If the MOSI, SCK, and MISO PADs are soldered to the other side, W5500 will communicate with mega via the digital pins 11, 12, and 13 of MEGA.