UTMI+ Low Pin Interface (ULPI), a generic low pin interface (LPI) between a Link and a PHY.
1. general
ULPI defines a PHY to Link interface of 8 or 12 signals that allows a lower pin count option for connecting to
an external transceiver that may be based on the UTMI+ specification. The pin count reduction is achieved
by having relatively static UTMI+ signals be accessed through registers and by providing a bi-directional
data bus that carries USB data and provides a means of accessing register data on the ULPI transceiver.
2. signal
USB and Miscellaneous signals may vary with each implementation and are given only as a guide to PHY designers.
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