Read version from w5500

Question

Hello, we use the w5500 in our project on a VxWorks environment, and once in a while we want to check if WIZNET is alive, so I thought in order to implement that I could read the chip’s version with wiz_getVERSIONR(). The datasheet says this function should return 0x04, but I receive there sometimes 0x10, sometimes 0xFF, sometimes 0x03 and sometimes 0xA8. What could be the reason that I don’t manage reading the chip’s version? Thanks!

irina · Answer

The version register value is 0x04, this is a fixed value. If it is read with a different value each time, you need to check whether SPI works normally. Various reasons SPI clock destabilization , CSn Control problem… etc