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2.2 Unpacking Precautions
Some components of WAFER-5825 SBC are very sensitive to
static electric charges and can be damaged by a sudden rush
of power. To protect it from unintended damage, be sure to
note these precautions:
Ground yourself to remove any static charge before touching
the Wafer-5825 SBC. You can do it by using a grounded wrist
strap at all times or by frequently touching any conducting
materials that is connected to the ground.
Handle your Wafer-5825 SBC by its edges. Don’t touch IC
chips, leads or circuitry if not necessary.
Do not plug any connector or jumper while the power is on.
2.3 System Memory DRAM
There is one 144-pin SO-DIMM socket to accept 3.3V
non-buffered SDRAM. The max Memory size is 512MB.
2.4 Watch-Dog Timer Setting
The Watch-Dog Timer is enabled by reading port 543H. It
should be triggered before the time-out period ends, otherwise
it will assume the program operation is abnormal and will issue
a reset signal to restart. The Watch-Dog Timer is disabled by
reading port 143/943H. For Detail information on Watch-Dog
Timer, Refer to Appendix A
•
JP1: Watch-Dog Active Type Setting
JP1
DESCRIPTION
SHORT
RESET WHEN WDT TIME-OUT
OPEN
DISABLE WDT
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2.5 Clear CMOS Setup
If you have to clear the CMOS Setup (for example, if you forgot
the password, you should clear the CMOS and then set the
password again.), you should close the JP3 (Pin2 and Pin3)
about 3 seconds, then open it again. Opening JP3 can set the
CMOS back to normal operation mode,
•
JP3 Clear CMOS Setup (Reserved Function)
JP3 DESCRIPTION
1-2
Normal Operation
2-3
Clear CMOS Setup
2.6 LCD Vcc Voltage Selector
The LCD interface connector CN3 can provide 5V or 3.3V
power supply by selecting the JP2 to meet the different LCD
requirement.
JP2 DESCRIPTION
1-2
5V
2-3
3.3V