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A USB power control switch is used to control the power and protect against short-circuit
conditions.
If the USB voltage is short circuited or more than 500mA is drawn from either supply the switch
will turn off the power supply and automatically protect the device and board. The VBUS signal
is derived from the +5V supply via the VIPER.
If you are require details for the USB bus, or would like to determine whether particular
peripherals are available then please check the following Internet site
www.usb.org
.
A factory fit option, changes USB port 1 from the host interface to a client. Please contact
Arcom for more details.
General Purpose I/O
Eight general-purpose inputs and eight general-purpose output lines are provided on the
VIPER. These lines are routed to a 20-way 2mm header PL9. The header provides buffered 5V
tolerant signal. An output state of ‘1’ is driven to 3.3V.
Inputs can be read from offset 0x50000 of CS5 (0x18050000).
The following GP lines from the PXA255 processor can control the outputs:
VIPER Outputs
PXA255 GP
D0 GP20
D1 GP21
D2 GP22
D3 GP23
D4 GP24
D5 GP25
D6 GP26
D7 GP27
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