Chapter 3 | Hardware |
Utility Interfaces
The Utility interfaces consists of three connectors that provide the standard interface signals, which include the:
•Utility 1
♦Keyboard
♦External battery connection
♦Reset Switch
♦PC Speaker
•Utility 2
♦PS/2 Mouse
♦SMBus signals
♦USB signals for USB ports 1 and 2
♦Power button signal
•Utility 3
♦USB signals for USB ports 3 (USB0) and 4 (and USB1)
Utility 1 Interface (J16)
Utility 1 interface consists of a
•Keyboard
•Battery
•Reset Switch
•Speaker
Keyboard Interface
The signal lines for the PS/2 keyboard are provided through the Utility 1 interface (J16), which is also fully PC/AT compatible.
External Battery
An external battery input connection is provided through the Utility 1 interface (J16) for the Real Time Clock’s operation in the event the
Reset Switch
The signal lines for a reset switch (hard or soft) are provided through the Utility 1 interface (J16).
NOTE | To perform the equivalent of a |
| must be pressed and held for a minimum of three seconds. |
|
|
PC Speaker
The signal lines for a speaker port with
LittleBoard 550 | Reference Manual | 47 |