REL 1.0
Page 47 of 89
RZ/G1M/G1N Qseven Development Platform Hardware User Guide
iWave Systems Technologies Pvt. Ltd.
2.7.3
USB2.0 Port1 (OTG)
The RZ/G1M/G1N Qseven carrier Board supports USB2.0 High Speed OTG interface through RZ/G1M/G1N CPU’s
USB0 interface. This USB2.0 Port1 signals of Qseven MXM connector is directly connected to USB2.0 MicroAB
connector (J2). This port can be used as USB OTG functionality which supports USB host and USB device based on
USB ID pin status. This USB ID pin is also connected to DIP switch (SW2) 8
th
position and can be used to force this
port as USB host alone by setting to ON position.
The VBUS power of this USB2.0 connector is connected through current limit power switch which can be used to
switch On/Off the power based on the device or Host and also limits the current above 500mA in host mode. The
connected Qseven SOM detects the USB functionality through USB ID pin and controls the power using the
USB_DRIVE_VBUS pin (56
th
pin) of Qseven MXM connector. In Host mode, USB_DRIVE_VBUS should drive high to
enable the power to the connector and in device mode, USB_DRIVE_VBUS should drive low to disable the power to
the connector.
If connected USB2.0 device takes more than 500mA current, current limit power switch limits the current to
constant mode and sends the over current indication signal to the over current indicator pin of Qseven MXM
connector USB port 0 & 1. This USB2.0 OTG connector is physically located at the top of the board as shown below.