Have a design using the TUSB9261 that will not enumerate when connected to PC with USB 2.0 cable (using a usb switch ts3usb221a).
3.3V and 1.1V supplies ramp up simultaneously so that 1.1V is up prior to 3.3V. Reset deasserts 5 ms later. Clocking at 40MHz with FREQ SEL0\1 pin pulled to 3.3V . Have opened the SPI data in line just in case. And there is activity on the SPI clock line - CS activates. But no activity is seen on the DP, DM USB lines ever.
Windows does not see it.
USB3.0 lines are open.
GPIO3 is OPEN.
USB_VBUS pin has ~0.5V .
Have read data sheets, app notes and looked at EVM manual - must have missed something.
Anyone have insight on this?
Regards,
