Freescale Semiconductor TWR-MCF52259-Ethenet manual USB On-the-GoHow does it work?

Appendix A USB On-the-Go

USB On-the-Go:How does it work?

To implement OTG, two new protocols were added in the USB 2.0 addendum. These new protocols allow USB OTG host wake-up and role reversal respectively. They are:

SRP = Session Negotiation Protocol

HNP = Host Negotiation Protocol

SRP introduces these new/expanded states:

OTG-A device: a_idle, a_wait_vfall, b_idle

OTG-B device: b_srp_init

HNP introduces these new/expanded new states:

OTG-A device: a_peripheral, a_suspend, a_idle

OTG-B device: b_idle, b_host, b_wait_acon, a_idle