Contec BX-100n-DC5000-C01 User Manual page 48

* 4001h (bit4-6): Alarm out output control
D5
D7 D6
--- WD_S1 WD_S0
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
When power is
WD_S1 WD_S0
turned off
0 0 OFF
1 0 OFF
1 1 OFF
0 1 OFF
* 4002h: WDT control
D7 D6 D5
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
D7 D6 D5
T7 T6 T5
Figure 4.8. WDT Counter Port (4003h)
W : Writes watchdog timer count data.
Write watchdog timer counter expiration time data.
→
1sec
→
8sec
→
15sec
→
30sec
BX-100n User's manual
D4 D3
PO2_M RESET PIM2
External alarm output status
When BIOS
starts
OFF
OFF
ON
ON
D4 D3
D4 D3
T4 T3
01h
08h
0Fh
1Eh
D2 D1
D0
PIM1 PIM0
When When time
WDT starts expires on WDT
OFF
ON
ON
OFF
D2 D1 D0
D2 D1 D0
T2 T1 T0
4. Each Component Function
R/W (Default: XXXX0000b)
ON
OFF
OFF
ON
R/W
W
41