Table of Contents
Advertisement
Chapter 3
Utility 3 Interface (J18)
The Utility 3 interface is a 10-pin connector used to provide the two of the 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 Utility 3 interface.
•
USB ports 2 (USB2) and 3 (USB3)
USB Signals (USB2 and USB3)
The LittleBoard 700 contains one root USB hub with four functional USB ports. This connector (Utility
3) provides two (USB2 and USB3) of the four USB ports. The hub is USB v.1.1 and Intel Universal
HCI v.1.1 compatible.
Features implemented for the USB ports include the following:
•
One root hub and two USB ports on this connector
•
USB v.1.1 and Intel Universal HCI v.1.1 compatible
•
Integrated physical layer transceivers
•
Over-current detection status on the USB port (software)
• Over-current fuses for all four ports on the LB 700 board. See Table 2-3.
NOTE
Ampro does not recommend connecting a USB boot device to the
LittleBoard 700 through an external hub. Instead, connect the USB
boot device directly to the LittleBoard 700. Refer to Chapter 4, BIOS
Setup for more information.
Table 3-19. Utility 3 Interface Pin/Signal Descriptions (J18)
Pin #
Signal
1
USB3PWR
2
USB4PWR
3
USBP3-
4
USBP4-
5
USBP3+
6
USBP4+
7
USB3GND
8
USB4GND
9
SHIELD3
10
SHIELD4
Notes: The shaded area denotes power or ground.
48
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 Signal -
I/O
USB 4 Signal -
I/O
USB 3 Signal +
I/O
USB 4 Signal +
-
USB Port ground
USB Port ground
-
USB Port shield (Cable Shield)
-
-
USB Port shield (Cable Shield)
Reference Manual
Hardware
LittleBoard 700
Advertisement
Table of Contents
