W6100 last byte becomes first

Question

Hello! I have a quite strange problem. I send a message ‘12345678’ to the W6100 and then read form it’s buffer ‘81234567’. I just always have my last byte on the first position. If I continue sending this message I continue recieving the same result, I mean ‘81233456781234567’. Could you help with this problem, please?

mon2 mon2 · Answer

Hi. I am new to the W6100 and about to start some new designs with this controller but thought to ask - could this be due to an internal cyclic buffer? What if you write “1234567” and read this back - what is the result?

Mihail Balezin · Answer

Thank you for your help! You were right, It was my mistake. My MCU operates with 80 MHz frequency, so I was sure, that there shouldn’t be any problem with bus communication with 100 MHz Wiznet. I just increased timings and now it works properly.