Contec BX-100n-DC5000-C01, User Manual, Page: 48 / 145

4. Each Component Function
BX-100n User’s manual
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* 4001h (bit4-6): Alarm out output control
--- WD_S0 R/W (Default: XXXX0000b) WD_S1 PO2_M PIM2 PIM1 PIM0 RESET
D6
D5 D4 D3 D2 D1
D0 D7
Figure 4.6. Alarm Out Output Control Port (4001h)
PO2_M : PO PO2/WDT pin output setting
0 : Set the RAS connector's PO2/WDT(12) signal to PO2 (general-purpose output).
1 : Set the RAS connector's PO2/WDT(12) signal to alarm out.
Table 4.13. WD_S1, WD_S0: Alarm-out Output Status Settings
External alarm output status
WD_S1 WD_S0 When power is
turned off
When BIOS
starts
When
WDT starts
When time
expires on WDT
0 0 OFF OFF OFF ON
1 0 OFF OFF ON OFF
1 1 OFF ON ON OFF
0 1 OFF ON OFF ON
* 4002h: WDT control
R/W
D6 D5 D4 D3 D2 D1 D0 D7
Figure 4.7. WDT Control Port (4002h)
R : Cancels WDT stop/alarm.
Read data is undefined.
W : Start and clear the WDT
Write A5h to start and clear the WDT.
* 4003h: WDT counter
W
D6 D5 D4 D3 D2 D1 D0 D7
T6 T5 T4 T3 T2 T1 T0 T7
Figure 4.8. WDT Counter Port (4003h)
W : Writes watchdog timer count data.
Write watchdog timer counter expiration time data.
1sec
→
01h
8sec
→
08h
15sec
→
0Fh
30sec
→
1Eh