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Functional Description
The watchdog timer is programmable via registers in the ISA I/O memory
map. The watchdog timer is protected from being accidentally enabled. The
4
timer supports a range of count down time-outs from 18 milliseconds to 291
seconds.
I/O address map
PCI system memory and I/O are configured or enumerated dynamically each
time the system boots or by an operating system (Plug and Play), but there are
legacy I/O locations that remain constant.
Table 4-3 shows I/O addressing. Functions listed with (opt) are not normally
occupied by on-board resources. BIOS Setup or special utilities may be used
to enable or relocate these features from their default values.
4-4
• Set a flag in a register in ISA I/O memory map
• Item 2 + Assert a selectable ISA interrupt
• Item 2 + Assert NMI followed by a system reset.
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