SOLVED - W3150A+ does not execute commands in Sn_CR

Question

Hello, I’ve got here a W3150A+ connected to a PHY on our own PCB. Well, SPI connection works fine, but if we perform a command (e.g. 0x10) to Sn_CR (Socket Command Register) it will not be executed. If we read the Sn_CR via SPI, the written command remains in Sn_CR. Sn_CR should be automatically cleared after a command was executed, that’ s what the datasheet says, or is another command necessary? Can I assume, if the written command remains in Sn_CR, it was not executed? Or, was it executed but the automatic clearing mechanism didn’t work? Can any (wrong) signal (too high, too low) on any Pin cause this problem? Confusing: We have also a NM7010B+, which is also useing a W3150A+ from WIZnet and for this module our code works finde. The Sn_CR is cleared immediately after writing. Any suggestions? Thanks a lot!

Daniel · Answer

Our module has almost the same schematic as the NM7010B+, well Layout is quite bigger (like Arduino shields). Clock works fine, both PHY and Wiznet I don’t have any signls on MII neither TXC/RCX nor any DATA (measured with Osci) Didn’t chek link signal, but could it relenant for the “hang” siutation?

miaooaim · Answer

Hi, if you don’t have the RX and TX clock on MII port, the command in Sn_CR will not be executed. Check why the PHY don’t generate the clock. Regards G.

Daniel · Answer

Thanks for the hint, it gave me the right direction for further investigations^^ My PHY has to be initialized by different MDIO write commands to a bunch of different registers (and first of all a software reset command, didn’t consider this^^). After this, I could measure a clock at the TCX/RXC pin and my commands in Sn_CR were executed. Problem solved! Thanks you very much!