Specifications

Chapter 3 Hardware

30 Reference Manual LittleBoard 800

Utility 3 Interface

The Utility 3 (J14) 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 3-10 gives the pin signals for the Utility 3 interface, which uses 10 pins, 2 rows, odd/even, (1, 2) with

0.100" pitch.

• USB ports 3 and 4

USB Signals (USB3 and USB4)

The LittleBoard 800 contains two root USB hubs with four functional USB ports. This header

(Utility 3) provides two of the four USB ports (USB3 and USB4). The hub is USB EHCI V2.0 and UHCI

V1.1 compatible.

Features implemented in the USB ports include the following:

• USB EHCI V2.0 and Universal UHCI V1.1 compatible

• Integrated physical layer transceivers

• Over-current detection status on the USB port (software)

Note: The shaded area denotes power or ground.

Audio Interface

The audio solution on the LittleBoard 800 is provided by the Realtek ALC203-LF audio CODEC. The chip

is defined by AC97 and is revision 2.2 compliant. The audio interface signals are supplied to the 26-pin

2mm connector (J9). Refer to the following list for the Audio CODEC (ALC203-LF) features.

• Analog Mixer Dynamic Range 97dB (typ)

• D/A Dynamic Range 89dB (typ) and A/D Dynamic Range 90dB (typ)

• AC’97 Rev 2.1 compliant

• High quality Sample Rate Conversion (SRC) from 4kHz to 48kHz

• 3D Sound circuitry and PC-Beep passthrough to Line Out while reset is held active low

CAUTION ADLINK 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.

Table 3-10. Utility 3 Interface Pin/Signal Descriptions (J14)

Pin # Signal I/O Description

USBPWR3 - +5V USB Port Power – Port is disabled if this input is low.

USBPWR4 - +5V USB Port Power – Port is disabled if this input is low.

3 USBP3- I/O USB 3 Negative Data Signal

4 USBP4- I/O USB 4 Negative Data Signal

5 USBP3+ I/O USB 3 Positive Data Signal

6 USBP4+ I/O USB 4 Positive Data Signal

USBGND3 - USB Port ground

USBGND4 - USB Port ground

9 NC - Not Connected - Reserved

10 NC - Not Connected - Reserved