Texas Instruments TM4C129x series: Is the USB PHY built-in?
Microcomputer
USB PHY is integrated. However, although Full Speed/Low Speed transfer modes are supported, High Speed is not supported. When using at High Speed, it is necessary to connect an external PHY to the ULPI interface port.
For details, see Chapter 24 (from p1769) of the data sheet.
http://www.ti.com/general/docs/lit/getliterature.tsp?genericPartNumber=TM4C129ENCPDT&fileType=pdf
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