ADLINK Technology cPCI-3915A, Руководство пользователя

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52 Utilities
When the watch dog timed out, it will send a RESET signal to the
system.
7.2 Using the Watchdog in an Application
The following section describes the WDT functions in an applica-
tion. The WDT reset function is explained in the previous section.
This can be controlled through the registers in the cPCI Super I/O
chip.
An application using the reset feature enables the watch dog func-
tion, sets the count-down period, and reloads the timeout value
periodically to keep it from resetting the system. If the timer count-
down value is not reloaded, the watch dog resets the system hard-
ware after its counter registers zero.
For a detailed programming sample, refer to the sample code pro-
vide in the ADLINK All-In-One CD. You may find this in the follow-
ing directory: X:\cPCI\cPCI-3915\WDT\WDT.ASM
7.3 Intel® Preboot Execution Environment (PXE)
The cPCI-3915 series supports Intel® Preboot Execution Environ-
ment (PXE), which is capable of booting or executing an OS instal-
lation over an Ethernet connection. A DHCP server in the network
must be present and one or more servers must have PXE and
MTFTP services. For example, a server running on Windows® NT
or Windows® 2000 and has DHCP, PXE, and MTFTP services or
a dedicated DHCP server with one or more additional servers with
PXE and MTFTP services. This section describes the major items
required for building a network environment with PXE support.
1. Set up a DHCP server with PXE tag configuration.
2. Install the PXE and MTFTP services.
3. Create a boot image file on the PXE server (also the
boot server).
4. Enable the PXE boot function on the client.