In my application I have a LAN7800 connected to a uPD720210. For routing reasonst the + and - are switched on both SSRX and SSTX and the device is not recognized by my linux system. If I remove the coupling capacitors on the SS signals the LAN7800 ist recognized as USB2 device as expected. Could it be possible that the uPD720210 does not support automatic polarity detection? I found no information in this topic in either the data sheet or the manual.
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Best regards, Cindy, Renesas Online Applications Support Engineer
Thanks.