Specifications

Chapter 3 Hardware
28 Reference Manual LittleBoard 735
Mouse Interface
The signal lines for a PS/2 mouse are provided through the Utility 2 interface (J13).
Note: The shaded area denotes power or ground. The signals marked with * = Negative true logic.
Table 3-8. SMBus Reserved Addresses
Component Address Binary
SDRAM SODIMM 1010,000x
b
Clock Generator (9LPRS501) 1101,001x
b
I/O Hub (82801GBM) 0000,000x
b
(default) Programmable Master
Table 3-9. Utility 2 Interface Pin Signals (J13)
Pin # Signal I/O Description
1 NC - Not connected (Lid Switch)
2 PWRBT* I Power Button – This signal from an external switch to the I/O Hub is not
used with AT Power supplies.
3 BATLOW* Battery Low – This signal from external battery indicates to the I/O Hub
there is insufficient power to boot the system.
4 NC O Not connected (IR Mode select)
5 NC - Not connected (IR Transmit Data)
6 NC - Not connected (IR Receive Data)
7
GND - Ground
8
VCC - +5 Volts
9 MDATA I/O Mouse Data – Data signal provided to external mouse connector.
10 MCLK I/O Mouse Clock– Clock signal provided to external mouse connector
11
GND - Ground
12
VCC - +5 Volts
13 SMBCLK - SMBus Clock – Clock signal provided to external devices.
14 SMBDATA - SMBus Data – Data signal provided to external devices.
15
NC - Not connected (+5V USB Port Power)
16
NC - Not connected (+5V USB Port Power)
17 NC - Not connected (USB 0 Negative Data Signal)
18 NC - Not connected (USB 1 Negative Data Signal)
19 NC - Not connected (USB 0 Positive Data Signal)
20 NC - Not connected (USB 1 Positive Data Signal)
21
NC - Not connected (USB Port ground)
22
NC - Not connected (USB Port ground)
23 NC - Not connected [USB Port shield (Cable Shield)]
24 NC - Not connected [USB Port shield (Cable Shield)]