Freescale Semiconductor TWR-MCF52259-Ethenet - Manual (Page 130)

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Introduction to USB USB On-the-Go:
Negotiation process
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6. To return control back to OTG-A (host) , OTG-B (device) stops
using bus and becomes peripheral/device.
7. OTG-A (host) sees lack of activity, disconnects and becomes
host.
Host Negotiation Protocol continued:
Note:
If the OTG-B (device) does not STALL the
SetFeature(b_hnp_enable) command, the OTG-A (host) must give the
OTG-B (device) an opportunity to become host before the OTG-A
(host) may turn off
V
BUS
.