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Introduction
Watchdog Timer
The watchdog timer optionally monitors system operation and can be
programmed for different timeout periods (from 1 seconds to 255 seconds
or 1 minute to 255 minutes). It is a two-stage watchdog, meaning that it can
be enabled to produce a non-maskable interrupt (NMI) or a "CPU init"
before it generates a Reset. Failure to strobe the watchdog timer within the
programmed time period may result in an NMI, a reset request, or both. A
register bit can be enabled to indicate if the watchdog timer caused the
reset event. This watchdog timer register is cleared on power-up, enabling
system software to take appropriate action if the watchdog generated the
reboot. See Chapter 7, "Watchdog Timer," for more information, including a
sample code.
IEEE-1284 Parallel Port/Printer Interface
The parallel I/O interface signals are routed to a 26-pin header on the board.
This port supports the full IEEE-1284 specifications and provides the basic
printer interface.
Firmware will initialize the parallel port as LPT1 with ISA I/O base address
of 378h. This default configuration also assigns the parallel port to IRQ7.
The printer interface mode (Normal, Extended, EPP, or ECP) is selectable
through the BIOS SETUP utility with the Winbond W83627HF Super I/O
device managing the NuPRO-840’s parallel port.
Universal Serial Bus (USB)
The Universal Serial Bus (USB) provides a common interface to slower-
speed peripherals. Functions such as keyboard, serial ports, printer port,
and mouse ports can be consolidated into USB, simplifying the cabling
requirements of computers. The NuPRO-840 provides two USB ports pin
headers (CN11) and is controlled by the Intel 82801 (ICH2) device.
IDE Controller and Floppy Interface Controller
The NuPRO-840 includes an IDE Controller (in the ICH2) and a Floppy Disk
Controller (in the W83627HF). The IDE Controller provides support for
internal or external IDE drives. Signals are available at the IDE connectors
CN1 and CN3 and are routed to a 40-pin header. The FDD Controller
provides support for an external FDD drives. Signals are available at the
FDD connector CN5 and are routed to a 34-pin header.
Summary of Contents for NuPRO-840 DV
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