Specifications

10
Because right now in the market have several kind of CPUs
using different voltage in core logic. For example the AMD
offers 486DX2-66/80 and DX4-100/120 at 3.3V,Intel offers
DX4-75/100 at 3.3V,and some Cyrix CPU will use 3.45V.
CPU Voltage JP13
* +3.3V 2-3
+3.45V 1-2
(*) : default setting
2.4 Watch-Dog Timer
The Watch-Dog Timer is enabled by reading port 443H. 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 start again, or activate NMI to CPU. The Watch-Dog
Timer is disable by reading port 043H. See Appendix A for more
detailed description of Watch-Dog Timer.
• JP15 : Watch-Dog Active Type Setting
JP15 DESCRIPTION
*1-2 RESET WHEN WDT TIME-OUT
2-3 ACTIVATE NMI TO CPU WHEN WDT TIME-OUT
OPEN DISABLE WDT
(*): default setting
• JP16: WDT Time-Out Period
PERIOD 1-2 3-4 5-6 7-8
1 sec. OPEN OPEN CLOSE OPEN
2 sec. OPEN OPEN CLOSE CLOSE
*10 sec. OPEN CLOSE OPEN OPEN
20 sec. OPEN CLOSE OPEN CLOSE
110 sec. CLOSE OPEN OPEN OPEN
220 sec. CLOSE OPEN OPEN CLOSE
(*) : default setting