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I have an Arduino Ethernet Shield and trying to connect it to my spartan 6 board. I used the ICSP header on the bottom of Arduino Ethernet Shield (MISO/SCK/RST/+5/MOSI/GND) and a wire for SS(pin 10 of board header), in sum, 7 wire. But i cannot find out why my MISO feedback during write operation is once true and once not, as you see in the picture(it should be 0X00 0X01 0X02 0X03 according to 6.3.3 part of w5100's datasheet). Can anyone help me? enter image description here enter image description here * signals up to down in scope capture are: SCK(not visible because of sample frequency)/MOSI / MISO /SS

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    \$\begingroup\$ Note that the Spartan-6 is a 3V3 device and the Arduino is 5V. Also a zoomed in trace of one byte would be better. \$\endgroup\$ – Oldfart Jan 13 at 12:38

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