Freescale Semiconductor TWR-MCF52259-Ethenet User Manual page 127

USB On-the-Go:
When using A and B plugs, initially the device using the A plug is
declared the host and the one using the B plug is declared the
device. When using the mini-AB receptacle the ID plug pin declares
the initial state of a device as host or device. State is then changed
during host negotiations protocol by turning a pull-up resistor on
and off.
A-device
V
BUS
D-
Dual-role
D+
Device
ID
GND
Default Host
Introduction to USB
Mini-AB receptacle
Mini-A plug
Initial declaration
TM
V
BUS
D-
D+
ID
GND
Mini-B plug
Default Peripheral
B-device
Dual-role
Device