Mainboard User’s Manual
12
Setting Jumper Switches
Jumpers are sets of pins which can be connected together with
jumper caps. The jumper caps change the way the mainboard
operates by changing the electronic circuits on the mainboard. If a
jumper cap connects two pins, we say the pins are SHORT. If a
jumper cap is removed from two pins, the pins are OPEN.
Jumper J5~J14: SDRAM Type Selector
The ten jumpers all consist of eight sets of 2-pin jumpers. Use
these jumpers to select the SDRAM type for the system
memory.
Function
Jumper Setting
DDR DIMM socket
Short all Pins 1-2
SDRAM DIMM socket
Open all Pins 1-2
Jumper JP1: RAM Voltage Selector
Use this 2-pin jumper to select the voltage for the installed
SDRAM module.
Function
Jumper Setting
3.3V for SDRAM
Short Pins 1-2
2.5V for DDR
Open Pins 1-2
Jumper JP2: Codec Selector
Use this jumper to select the onboard audio codec or Audio
Modem Riser (AMR) slot.
Function
Jumper Setting
Primary codec onboard
Short Pins 1-2
Primary codec on AMR slot Open Pins 1-2
1
JP3
JP5
1
JP6
JP1
JP2A
1
1
JP2
