ADLINK NuPRO-840 P4 Industrial SBC Architecture Maintenance

Supports two-level triggering: the first level can choose NMI or Initiat, and the second level triggers a hard reset.

Key jumpers and configurations

There are only two user configuration items on the NuPRO-840, both located in specific positions on the motherboard:

1. Clear CMOS (JP1)

Normal operation: 1-2 short circuits (default).

Clear CMOS: Move the jumper cap to 2-3 and hold for about 2 seconds before moving it back to 1-2 to clear BIOS settings and passwords.

Application scenario: When unable to start due to BIOS parameter errors, use this operation to restore the factory default.

2. Front panel reset (pins 15-16 of CN16)

It is not a jumper, but connected to CN16's 15 (RESETBTN) and 16 (GND) through the front panel buttons of the chassis to achieve external hard reset.

Power consumption characteristics and heat dissipation requirements

Based on the high power consumption characteristics of the Pentium 4 architecture, special attention should be paid to the power and heat dissipation design of the NuPRO-840. Taking the P4 2.4GHz+1GB DDR configuration as an example, the measured power consumption is as follows:

Power rail current power

+5V 5.24A 26.20W

+12V (CPU powered) 4.46A 53.52W

+12V (system, including CPU fan about 200mA) 0.4A 4.80W

-12V 0.1A 1.20W

Total - approximately 85.72W

Key project reminder:

Forced air cooling (recommended external airflow+CPU fan) must be provided inside the chassis to ensure that the CPU core temperature does not exceed 100 ° C under any operating conditions, otherwise permanent damage may occur.

If using ATX power supply, it is necessary to ensure that the+12V power supply capacity is not less than 5A (measured CPU consumes 4.46A separately). It is recommended to choose an ATX power supply with a rated power of not less than 300W.

If Wake On LAN and other functions are required, it is also necessary to ensure+5VSB standby power supply capability.

System monitoring and SMBus address

The SMBus of NuPRO-840 can access multiple onboard devices for status reading and diagnosis:

From device address function device

0xA0 DIMM0 SPD Information DIMM1

0xA2 DIMM1 SPD Information DIMM2

0xAD Control and Status W83627HF

Built in LAN ID and control 82562EM/82540EM

Chassis Intrusion: Connected to the microswitch on the chassis cover via JP2. Even if the system is powered off (as long as the battery or standby power is present), intrusion events can still be latched and alarms can be cleared through the SMI # mask register of W83627HF.

Watchdog Timer Programming Guide

The watchdog of NuPRO-840 is based on Winbond W83627HF logic device 8, configured through I/O ports 2Eh/2Fh (or 3F0h/3F1h). The following is an example of a 15 second timeout reset (in assembly language):

assembly

Enter the extended function mode

mov dx, 2eh

mov al, 87h

out dx, al

out dx, al

Configure CR2B - Select WDTO function (bit4=0)

mov dx, 2eh

mov al, 2bh

out dx, al

mov dx, 2fh

mov al, 0c0h

out dx, al

Select logical device 8

mov dx, 2eh

mov al, 07h

out dx, al

mov dx, 2fh

mov al, 08h

out dx, al

Configure CRF5- Control Register

mov dx, 2eh

mov al, 0f5h

out dx, al

mov dx, 2fh

mov al, 00h   ; Bit3=0->seconds; Bit3=1->minutes

out dx, al

Set timeout value CRF6 to 15

mov dx, 2eh

mov al, 0f6h

out dx, al

mov dx, 2fh

mov al, 0fh   ; 15 seconds/minute

out dx, al

Exit the extended function mode

mov dx, 2eh

mov al, 0aah

out dx, al

Practical tip:

In the application, it is possible to periodically 'feed the dog' by writing overload values to specific registers (or using keyboard/mouse interrupts).

If using the second level reset function of WDT, it is necessary to ensure that bit 4 of CR2B is 0 (select WDTO instead of GPO24).

ADLINK provides the testing tool test.exe (located on the accompanying CD) to quickly verify WDT functionality.

BIOS Setting Points

The NuPRO-840 uses Phoenix Ward BIOS and enters the settings interface by pressing the Del key during startup. The key configuration items include:

Chipset options: DDR timing parameters, AGP memory size, etc. can be set, it is recommended to keep them as default.

Power management: Supports ACPI and can configure wake-up events such as WOL and modem ring.

Integrated peripherals: The onboard VGA (SiS305), LAN, or audio (AC'97) can be disabled separately to release interrupt resources.

PNP/PCI configuration: If using a traditional ISA card, a specific IRQ can be set to "Legacy ISA" to avoid conflicts.

IDE configuration: Supports automatic detection of PIO/UDMA modes, it is recommended to set it to Auto to maximize performance.

Special note: NuPRO-840 supports a PXE pre boot execution environment and can be used for remote installation of operating systems on networks, making it suitable for large-scale deployment scenarios.