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RZ/G1H Qseven Development Platform Hardware User Guide
iWave Systems Technologies Pvt. Ltd.
2.7.3
USB2.0 Port1 (OTG)
The RZ/G1H Qseven carrier Board supports USB2.0 High Speed OTG interface through RZ/G1H
CPU’s USB
0 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. When the DIP switch (SW2) 8
th
position is OFF position, either Host or device functionality can be set
based on the USB ID pin status.
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.
