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Chapter 3
Utility 3 Interface (J14)
The Utility 3 interface is a 10-pin connector used to provide two of the four USB port signals to an
external board with USB connections or directly to the respective USB connector for the USB ports.
Table 3-19 gives the pin-outs and interface signals for the Utility 3 interface and it has 24 pins, 2 rows,
odd/even, (1, 2) with 0.100" pin spacing.
•
USB ports 3 (USB3) and 4 (USB4)
USB Signals (USB3 and USB4)
The LittleBoard 800 contains one root USB hub with four functional USB ports. This connector
(Utility 3) provides two (USB3 and USB4) of the four USB ports. The hub is USB V2.0 and Universal
UHCI V1.1 compatible.
Features implemented for the USB ports include the following:
•
One root hub and two USB ports on this connector
•
USB V2.0 and Universal UHCI V1.1 compatible
•
Integrated physical layer transceivers
•
Over-current detection status on the USB port (software)
NOTE
Ampro does not recommend connecting a USB boot device to the
LittleBoard 800 through an external hub. Instead, connect the USB
boot device directly to the LittleBoard 800. Refer to Chapter 4, BIOS
Setup for more information.
Table 3-19. Utility 3 Interface Pin/Signal Descriptions (J18)
Pin #
Signal
1
USBPWR3
2
USBPWR4
USBP3-
3
USBP4-
4
USBP3+
5
USBP4+
6
USBGND3
7
USBGND4
8
SHIELD3
9
SHIELD4
10
Note: The shaded area denotes power or ground.
LittleBoard 800
I/O
Description
-
+5V USB Port Power – Port is disabled if this input is low.
-
+5V USB Port Power – Port is disabled if this input is low.
I/O
USB 3 Negative Data Signal
I/O
USB 4 Negative Data Signal
I/O
USB 3 Positive Data Signal
I/O
USB 4 Positive Data Signal
-
USB Port ground
-
USB Port ground
-
USB Port shield (Cable Shield)
-
USB Port shield (Cable Shield)
Reference Manual
Hardware
49
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