ULPI
- ULPI(UTMI + Low Pin Interface) Working Group
- ULPI - The Standard for High-Speed USB PHYs
- Full- and low-speed USB systems utilize serial interfaces between the controller and PHY.
- High-speed requires a parallel interface between the controller and PHY in order to run the bus at 480Mbps.
- ULPI is implemented as a wrapper around a UTMI+ PHY to reduce pin count in Hi-Speed USB systems.
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