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Chapter 3
Miscellaneous
Utility Interface (J12)
♦
Power-On – This control signal is provided externally through a switch by connecting ground
to pin-1 on the Utility connector (J12).
♦
Reset Switch – This signal is provided externally through a switch by connecting ground to
pin-3 on the Utility connector (J12). This signal line is shared with Reset Switch (SW1).
♦
PC Beep Speaker – The output signals from the Southbridge (82801DBM) and the Super I/O
(W83627HF) are fed to pin-5 of the Utility connector (J12) through an OR circuit, and in
conjunction with the +5V (pin-4), drives an external PC Beep speaker. The PC Beep speaker
signal from the Southbridge is also fed to the on-board Audio CODEC to provide a PC Beep
signal for the Line out connections.
Table 3-18. Utility Interface Pin/Signal Descriptions (J18)
Pin #
Signal
1
PS_0n
2
GND
3
RST_SW
4
+5V
5
Speaker
Notes: The shaded area denotes power or ground.
Reset Switch (SW1)
The reset switch (SW1), located on the board edge, provides an internal reset signal (momentary
ground) to the ReadyBoard 800. The reset switch (SW1) shares the reset line with pin-3 of the Utility
interface (J12).
Keyboard/Mouse Interface (J19)
The PS/2 Keyboard and Mouse signal lines, also fully PC/AT compatible, share the same mini-DIN
connector (J19). A PS/2 Y-cable is used to connect to the PS/2 connector (J19), on the board edge.
NOTE
Either device can be connected to either of the connectors on the Y-cable.
The Southbridge senses where each device is connected and provides the
appropriate signals for both.
Table 3-19. Keyboard/Mouse Interface Pin/Signal Descriptions (J19)
Pin #
Signal
1
KB_Data
2
MS_Data
3
GND
4
+KBMS
5
KB_Clk
6
MS_Clk
7, 8, 9
GND
Notes: The shaded area denotes power or ground.
50
Description
Power On input (connect between pins 1 & 2)
Ground
Reset Switch input or output (connect between pins 3 & 2)
+5 Volts
PC Beep Speaker + Output (connect between pins 5 & 4)
Description
Keyboard data
Mouse Data
Ground
Keyboard/Mouse Power (+ 5V +/- 5%)
Keyboard Clock
Mouse Clock
Ground (Used for grounding the shield on the connector
Reference Manual
Hardware
ReadyBoard 800
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