ADLINK cPCI-6770 Series CompactPCI Motherboard Maintenance Guide

Temperature monitoring: The Pentium III processor has a built-in thermistor diode, and the onboard temperature sensor can read the core temperature through the SMB Data Interface. It is recommended that the system run stably for at least 30 minutes before verifying that the core temperature does not exceed 55 ° C (at ambient temperature).

Chapter 3: Jumper Configuration and COM2 Mode Switching

CPCI-6770 provides multiple jumpers for hardware level configuration, and some configurations can also be completed through BIOS settings.

3.1 Reset button (SW1)

SW1 is a front panel touch reset switch that triggers a hardware reset (hard reset) when pressed, equivalent to a power outage and restart. For situations where the system hangs but the watchdog is not triggered, this button can be used to manually restore it.

3.2 Clearing CMOS (JP2)

When BIOS settings are incorrect and prevent startup, the CMOS content needs to be cleared:

JP2 setting function

Short circuit Pin 1-2 to clear CMOS content

Pin 2-3 short circuit normal operation (default)

Operation steps: After power off, short-circuit pins 1-2 of JP2 for about 2 seconds, then restore them to pins 2-3 (normal position), and power on again to restore BIOS factory default settings.

3.3 COM2 serial port mode selection (JP1, JP3, JP4)

COM2 supports three protocols, RS-232/422/485, and is configured through a combination of three jumper wires (JP1, JP3, JP4). The jumper number indicates the pin pair that needs to be short circuited:

Mode JP1 JP3 JP4

RS-232 1-3 1-3 1-2, 2-4

RS-422 3-5 3-5 3-4, 4-6

RS-485 3-5 3-5 5-6, 4-6

The pin definition of RJ-45 in COM2 is different from that of standard RJ-45. When wiring, please refer to Table 15 in the manual (COM2 Pin Definition: Pin1 DCD, Pin2 RTS, Pin3 DSR, Pin4 TXD, Pin5 RXD, Pin6 GND, Pin7 CTS, Pin8 DTR).

3.4 PMC VIO voltage selection (zero ohm resistance)

The default VIO voltage for the PMC (PCI Mezzanine Card) interface is set by the factory to+5V (via zero ohm resistors R28 and R29). To switch to+3.3V, you need to:

Remove R28 and R29

Install R30 and R31 (both zero ohm resistors)

This configuration is applicable to PMC expansion modules of different voltage levels. Before modifying, it is necessary to confirm the module voltage requirements.

Chapter 4: Watchdog Timer - System Self healing Core

The cPCI-6770 is equipped with a dual level programmable watchdog timer, which is a key protection mechanism for unmanned systems.

4.1 Watchdog Architecture and Working Principle

The watchdog circuit is implemented in programmable logic devices and has a Control and Status Register that can record whether a reset is caused by a watchdog timeout.

Two level triggering mechanism:

First Stage: After timeout, trigger NMI (Non Shielded Interrupt) or Initiat (software optional) first.

Second Stage: If the first stage is not processed, then trigger a Hard Reset.

Programmable parameters:

Timeout period: 1-255 seconds or 1-255 minutes

Refresh method: Read the I/O port 3F0h (Watchdog Register) to reset the counter, and write operations are also reset to zero.

4.2 Using Watchdogs in Applications

Typical application process:

Enable watchdog reset function

Set terminal count value

Periodically 'feed the dog' in the main loop (read port 3F0h)

If the application freezes and cannot feed the dog, the system will automatically reset after timeout

Sample code location (ADLINK CD):

CHIPDRVWDTDOSCP6770DOS6770WDT.CPP

4.3 Troubleshooting of Common Watchdog Malfunctions

Possible causes and solutions for the fault phenomenon

The system frequently resets the feeding interval without reason, and if it exceeds the timeout setting, increase the feeding frequency or extend the timeout value

Watchdog does not trigger reset, not enabled. Check if the control register is written correctly in the watchdog or register configuration error code

NMI triggered but the system is not reset. Only the first level (NMI) is enabled, and the second level (reset) is not enabled. Both levels of triggering are enabled simultaneously in the control register

Chapter 5: Key BIOS Configuration Items

CPCI-6770 adopts Award PnP BIOS. Press the "Del" key to enter Setup when booting up. The following are key configuration items:

5.1 Priority of starting devices

Set the first/second/third boot device in the BIOS Boot Menu based on the installation medium of the operating system (floppy disk, CD, or hard disk).

Tip: If the OS installation requires a non boot CD-ROM, you need to first boot the OS with a CD-ROM drive (such as a DOS boot disk), and then access the CD.

5.2 Serial port redirection (Remote Console)

Support console redirection through serial port (terminal mode) for remote debugging. Serial port parameters (baud rate, data bits, etc.) need to be enabled and set in BIOS.

5.3 Hardware monitoring function

The onboard Winbond W83782D hardware monitoring chip can view CPU temperature, system temperature, fan speed, and various voltages (+3.3V,+5V,+12V, etc.) in BIOS. If the temperature or voltage is abnormal, the PC Health Status page will display a warning.

Chapter 6: Driver Installation Sequence and Special Precautions

6.1 Driver directory structure (ADLINK CD)