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3 Hardware Reference
This section gives an overview of the hardware features of the BitsyXb. The overview includes a
description of the switches, jumper settings, connectors, and connector pinouts.
Many connectors and headers have a visible number or marking on the board that indicates pin 1.
As seen from the component side, double-row headers on the board are
numbered as shown in the figure to the right.
If that pin is not clearly marked, there are two other ways to locate pin 1:
1.
For through-hole connectors, look at the underside of the board. The square pad is pin 1.
2.
For surface-mount connectors, look for numbers silk screened on the component side
of the
BitsyXb.
3.
Download the mechanical drawing of the BitsyXb available on the Eurotech Support site
(section 2.4). The square or indicated pad on each connector is pin 1.
3.1
Switches, Controls and Indicators
3.1.1
S1: DIP Switch
S1 is a two-position DIP switch located on the edge of the board at the opening of the PCMCIA
socket. When in the "ON" position, switches are closed and connect to ground. Otherwise, they
are pulled up.
DIP switch positions "1" and "2" connect to the PXA270.
Most operating systems on the BitsyXb reserve these switches for their use. Consult the operating
system manual for details.
3.1.2
LED Indicator
The BitsyXb has one onboard light-emitting diode (LED) located on the edge of the board at the
opening of the PCMCIA socket. It is turned on and off by the system controller. The LED is
driven by the same buffers as the display driver data lines. The LED will be off when the display
buffers are disabled. See section 5.3.2 for details.
3.2
Jumper Settings
There is just one user-selectable jumper on the BitsyXb. It uses a 2mm shorting block (shunt) to
select the setting. Turn off power to the BitsyXb before changing the position of a shunt.
6
The "component side" of the BitsyXb is the one on which the PCMCIA ejector is installed. As a
factory option, some connectors may be installed on the "bottom side" of the BitsyXb.
2 4 6 8...
1 3 5 7...
