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external series resistors with OTG_HS internal PHY?

Question asked by koepf.steffen on Sep 24, 2014

i am designing a device only usb port with the OTG_HS of the STM32F429. In the device datasheet, the device pins DP and DM are connected dirctly to the usb-port.
In the discovery kit 32F429IDISCOVERY there are 22R series resistors used.
What to do here?