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ETX-945 User Manual 1.00 www.diamondsystems.com Page 18
4.1.2 USB signals
These pins provide connections to the board’s four USB channels. For further information regarding the functions
of the USB signals listed above, refer to the USB 2.0 Specification, available from the USB Implementers Forum
(http://www.usb.org).
Signal Name
Signal Function
Direction
USB0+
USB Port 0 data +
In/Out
USB0-
USB Port 0 data -
In/Out
USB1+
USB Port 1 data +
In/Out
USB1-
USB Port 1 data -
In/Out
USB2+
USB Port 2 data +
In/Out
USB2-
USB Port 2 data -
In/Out
USB3+
USB Port 3 data +
In/Out
USB3-
USB Port 3 data -
In/Out
4.1.3 Audio interface
These pins carry stereo audio input and output as indicated.
Signal Name
Signal Function
Direction
SNDL
Line-level stereo output left; drives a 5k ohm load
Out
SNDR
Line-level stereo output right; drives a 5k ohm load
Out
AUXAL
Auxiliary A input left
In
AUXAR
Auxiliary A input right
In
MIC
Microphone input
In
ASGND
Analog ground
n/a
ASVCC
Power supply for audio controller
n/a