ADLINK cPCI-6965 6U CompactPCI Core Dual Core Single Board Computer

ADLINK cPCI-6965: Analysis of High Performance 6U CompactPCI Single Board Computer Technology Based on Core Dual Core

In the fields of military, aerospace, rail transportation, power automation, and high reliability industrial control, the CompactPCI (cPCI) bus platform has always been regarded by engineers as an ideal choice for building critical mission systems due to its robust Eurocard mechanical structure, excellent heat dissipation performance, high reliability connector design, and redundant power support on the backplane. However, with the increasing demand for data processing capability, graphics display performance, and communication bandwidth in applications, traditional low-power embedded processor platforms are gradually unable to meet the computing needs of the new generation of systems.

ADLINK (Linghua Technology) cPCI-6965 series 6U CompactPCI single board computer (SBC) was born in this context. It successfully integrated Intel ®  Core ™ The powerful computing power of the 2 Duo (Core Dual Core) processor is integrated with the robustness and reliability of the CompactPCI industrial platform, providing a highly competitive core computing platform for application scenarios that require both high-performance computing and high reliability operation.

Overview of Product Positioning and Hardware Architecture

The cPCI-6965 series is a highly integrated 6U CompactPCI single board computer, available in two specifications: single slot (4HP, 20.32mm wide) and dual slot (8HP, 40.64mm wide) to accommodate different chassis backplane slot resources and expansion capabilities. Its core hardware architecture revolves around Intel ®  The GME965 Express chipset is built specifically for embedded mobile platforms, achieving a good balance between performance and power consumption.

1. Processor options and performance metrics

CPCI-6965 supports Intel processors packaged in 478 pin Micro FCPGA, allowing users to flexibly choose based on their application's computing density and power budget

Intel ®  Core ™ 2 Duo T7500: With a clock frequency of 2.2GHz, it has 4MB of shared L2 cache, an 800MHz front end bus (FSB), and a maximum heat dissipation design power consumption (TDP) of 35W. The dual core architecture gives it significant advantages in multitasking parallel processing and complex algorithm computation.

Intel ®  Celeron ®  550: With a main frequency of 2.0GHz, 1MB L2 cache, 533MHz FSB, and a TDP of 27W. As a cost-effective option, it is suitable for control applications that are cost sensitive and have relatively moderate computing requirements.

Both processors support Intel ®  64 bit technology (EM64T) and Execute Disable Bit hardware security features provide a hardware foundation for running modern 64 bit operating systems and enhancing system security.

2. Chipset Core - GME965 and ICH8M

North Bridge (MCH) - Intel ®  GME965: Responsible for connecting processors, memory, and integrated graphics cores. Its dual channel DDR2 memory controller supports 667MHz/533MHz non ECC SO-DIMM memory and can support up to 4GB of system memory through two stacked SO-DIMM slots onboard. Integrated graphics core for Intel ®  Graphics Media Accelerator X3100（GMA X3100）， Supports DirectX 9 and OpenGL 1.5, and can dynamically share up to 384MB of system video memory.

South Bridge (ICH) - Intel ®  ICH8M: Responsible for providing rich I/O interfaces and bus expansion capabilities, including 6 PCI Express x1 channels (two for onboard dual gigabit network cards, two routed to backplane J2/J3 connectors for RTM expansion), IDE controller (for CompactFlash interface), SATA controller, USB 2.0 host controller, and LPC bus (for connecting Super I/O chips).

Deep analysis of key characteristics

1. Flexible and powerful graphic display solution

CPCI-6965 utilizes the GMA X3100 graphics core integrated with the GME965 chipset, combined with the Silicon Image Sil1362 SDVO (Serial Digital Video Output) PanelLink transmitter, to convert SDVO signals into DVI interface outputs. This board provides:

A DVI-I interface: supports both digital (DVI) and analog (VGA) signal output, and can be connected to a traditional VGA monitor through the included DVI to VGA adapter.

A DVI-D interface: only supports pure digital signal output.

This provides system integrators with the capability of Dual Independent Display, supporting two combinations of DVI+VGA or DVI+DVI. In human-machine interaction (HMI) scenarios where both the operating interface and monitoring screen need to be displayed simultaneously, this feature greatly improves operational efficiency and system visualization capabilities. Its maximum resolution can support up to 2048 × 1536 @ 75Hz (analog) and 2048 × 1536 @ 60Hz (digital), which is sufficient to meet the requirements of high-resolution industrial image display.

2. Configurability of high-precision serial interfaces

The two DB-9 serial ports (COM1 and COM2) on the board are provided by the ITE IT8712F Super I/O chip, and their functionality is far beyond that of ordinary PC serial ports. Each serial port can be independently configured into one of the following four modes through onboard DIP switches (SW1-SW4 for COM1, SW5-SW8 for COM2):

RS-232 full modem mode (default): A standard 9-wire full-featured serial port suitable for connecting traditional serial devices, modems, or industrial HMI panels.

RS-422 half duplex mode: differential signal transmission, strong anti-interference ability, suitable for long-distance (up to 1200 meters or more) point-to-point communication.

RS-485 half duplex mode: differential signal, multi-point bus topology, suitable for building industrial fieldbus networks (such as MODBUS RTU networks), connecting multiple sensors or actuators.

RS-485+Half Duplex Mode: An enhanced RS-485 configuration that typically differs in bias or terminal resistance handling to accommodate specific manufacturer's equipment requirements.

This design, which directly selects electrical characteristics through hardware jumpers, is more reliable and intuitive than pure software configuration, greatly facilitating engineers to conduct system debugging and fault isolation on site.

3. Rich onboard storage options

CPCI-6965 provides three flexible storage solutions to meet the differentiated requirements of different applications for capacity, speed, and reliability:

CompactFlash Type II slot: CF cards have become one of the most reliable boot media in embedded systems due to their anti vibration and wide temperature operation characteristics, making them ideal for installing embedded operating systems (such as Windows Embedded, Linux) and core applications.

Onboard 2.5-inch SATA hard drive installation position: With the included DB-6910SAT adapter board, a 2.5-inch SATA HDD or SSD can be directly installed on the PCB. This design provides convenience for applications that require large capacity data storage, such as logging and image caching.

USB NAND Flash module interface: The board comes with a 9-pin USB connector (CN7) that can be used to install a dedicated USB flash drive module. This provides a third option for applications that require additional small capacity, high reliability storage partitions.

I/O interface and system expansion capability

1. Front panel I/O layout (highly integrated)

The cPCI-6965 integrates rich I/O interfaces on the front panel, allowing it to complete complete complete system functions when running independently:

4 x USB 2.0 ports: Supports high-speed peripheral connections such as USB keyboard, mouse, USB flash drive, and dongle.

2 x 10/100/1000BASE-T Gigabit Ethernet ports: composed of two independent Intel ports ®  82573L PCIe Gigabit Controller Driver, supporting Teaming and PCIe remote boot, suitable for high reliability network communication or data transmission.

Dual DVI display output (one for DVI-I and one for DVI-D).

Dual DB-9 serial ports (supporting RS-232/422/485 configurable).

PS/2 keyboard mouse combination port (8HP version only).

Parallel port (limited to 8HP version only).

System status LED indicators: including power (green), general indicator (blue), watchdog timeout alarm (amber), and hard disk read/write indicator (red).

2. Rear Routing Module (RTM) Expansion

To achieve a true "front plug-in board+rear outlet" CompactPCI system architecture, the cPCI-6965 series offers multiple Rear Transition Module (RTM) options that route signals from the J3 and J5 connectors on the backplane to the back of the chassis, facilitating cable management and maintenance.

RTM model width mainly includes key components/interfaces on the rear I/O interface board

CPCI-R6000-965 4HP 2 × USB 2.0, VGA (DVI adapter), 68 pin SCSI external interface LSI53C1020 PCI-X Ultra320 SCSI controller (supports RAID 1), internal 68 pin SCSI, internal 7-pin SATA, floppy drive interface

CPCI-R6000-L 4HP 2 × USB 2.0, VGA internal 7-pin SATA, floppy drive interface (without SCSI)

CPCI-R6000-965D 8HP 4 × USB 2.0, VGA, PS/2 KB/MS, microphone/linear output, 68 pin SCSI LSI53C1020 SCSI controller, internal 68 pin SCSI, internal 7-pin SATA, floppy drive interface

CPCI-R6000D-L 8HP 4 × USB 2.0, VGA, PS/2 KB/MS, microphone/linear output internal 7-pin SATA, floppy drive interface (without SCSI)

Among them, the RTM model equipped with the LSI53C1020 Ultra320 SCSI controller supports data transfer rates of up to 320MB/s and RAID 1 (disk mirroring) functionality, providing a hardware level redundancy solution for critical data storage that requires high reliability. This feature is crucial in data acquisition and real-time control systems such as railway signal systems and power SCADA.

3. PMC expansion slot (8HP version only)

The cPCI-6965D and cPCI-6965DZ models (8HP width) provide a standard 32-bit/33MHz PMC (PCI Mezzanine Card) expansion slot through the included DB-6965PMC adapter card. The PMC slot supports 3.3V and 5V V (I/O) signals (selectable through onboard JPX1 jumper), allowing users to install dedicated PMC modules to enhance system functionality, such as:

Multi channel high-speed serial communication module (such as RS-232/422/485 multi port card).

Specialized data acquisition modules (such as A/D, D/A, digital I/O cards).

Fieldbus interface modules (such as CANbus, PROFIBUS, MIL-STD-1553).

Encryption/security module.

This PMC expansion capability greatly enhances the flexibility and lifecycle of cPCI-6965, allowing the system to adapt to different external interface requirements by replacing PMC modules without changing the basic CPU platform.

Key points of engineering deployment and system configuration

1. Power requirements and heat dissipation design

The cPCI-6965 series relies entirely on a single+5V power rail powered by the CompactPCI backplane. According to the measured power consumption data provided in the manual:

Equipped with Core ™ A system with 2 Duo T7500 processors, 2 x 2GB memory, and 60GB SATA hard drive, running at 100% CPU load under Windows XP, consumes a total current of 9.416A @ 5V, corresponding to a total power consumption of 47.08W.

Equipped with Celeron ®  The same configuration system with a 550 processor has a power consumption of 32.67W at full load.

This data is crucial for system integrators, as sufficient power margin must be reserved for each system slot when designing the power capacity and backplane power supply capability of the CompactPCI chassis. ADLINK recommends that industrial grade power supplies should provide at least twice the power capacity required by the system.

In terms of thermal management, the board adopts a passive heat sink design, but requires a forced airflow of at least 16CFM (cubic feet per minute) from the chassis air duct to ensure stable operation within the ambient temperature range of 0 ° C to 55 ° C. For high-power cores ™ 2 Duo configuration, especially attention should be paid to the selection of chassis fans and air duct design to prevent the CPU temperature from exceeding its maximum operating junction temperature (Tjunction_maX is 100 ° C).

2. Mechanical installation and component assembly

The installation of cPCI-6965 involves the assembly of multiple precision components, and the following key steps are worth engineers' attention:

SO-DIMM memory installation: using stacked SO-DIMM slots, first install the lower slot, and then install the upper slot. Be sure to align the foolproof notch of the memory module with the slot positioning key and press it in evenly.

Installation of 2.5-inch hard drive: The included DB-6910SAT adapter board must be used. First, fix the adapter board to the hard drive through four copper pillars, then insert the entire component into the board to board connector (CN14), and finally lock it with screws from the PCB soldering surface. When disassembling the hard drive, the adapter board must be pulled vertically upwards to avoid damaging the connector.

PMC module installation: Before installation, it is necessary to use the 3.3V/5V voltage button on the DB-6965PMC adapter board and the JPX1 jumper on the motherboard to ensure that the V (I/O) signal voltage of the PMC is consistent with the module requirements. Incorrect settings may result in permanent damage to the module.

USB Flash module installation: The USB module needs to be fixed to the CN5 connector of the board using dedicated copper pillars and screws, and the module size should not exceed 39mm × 29mm.

3. BIOS configuration tips

CPCI-6965 adopts AMI ®  Core 8 BIOS， The key configuration items include:

Watchdog Timer (WDT): Implemented through Super I/O IT8712F, it can be enabled/disabled in BIOS and supports a timeout range of 1 second to 15300 seconds. Engineers can visually determine whether the watchdog has experienced a timeout event through the onboard WDT LED (amber). In critical applications, it is essential to write periodic 'dog feeding' code to prevent the system from being unable to automatically recover due to unexpected deadlocks.

Remote Access Configuration: Supports BIOS level remote console redirection through serial port (COM1/COM2). After activation, POST self-test information can be remotely viewed, BIOS settings can be modified, and even the operating system can be booted through a serial port terminal (such as PuTTY). This is extremely useful for unmanned equipment deployed in difficult to access on-site environments such as high radiation and high temperature zones.

PXE remote boot: The onboard gigabit network card supports PXE (Preboot Execution Environment), which can boot the system through the network, making it easy to deploy large-scale operating systems on production lines without optical drives or floppy drives.

Built in USB Flash Module Startup: In the BIOS Boot Device Priority, the onboard USB Flash module should be correctly identified and set as one of the priority boot devices.

Best Practices for Application Scenarios

Scenario 1: Rail Transit Train Control Unit

In the train vehicle control system, cPCI-6965 can serve as the main control computing unit, running train network communication protocols (such as MVB, CANopen) and diagnostic software. Its Core ™ The powerful computing power of the Duo processor can be used to process real-time fusion and fault prediction algorithms for multiple sensor data. The dual gigabit Ethernet ports can be used to connect to the train backbone Ethernet (ECN), enabling data exchange with the driver's display screen, braking system, and air conditioning system. The wide temperature range (0 ° C to 55 ° C) and passive cooling design enable it to adapt to temperature fluctuations inside the cabin without the need for additional active cooling fans (reducing failure points). Combined with the SCSI RAID 1 function of cPCI-R6000-965D RTM, it can provide highly reliable data redundancy storage for the black box recording subsystem.

Scenario 2: Radar Signal Processing and Display System

In military or meteorological radar processing systems, cPCI-6965D (8HP with PMC) can simultaneously achieve real-time processing of radar data and human-machine interface display. The PMC slot can accommodate dedicated multi-channel high-speed serial or fiber optic communication modules for receiving digital intermediate frequency signals or control commands from radar receivers. The dual independent display function of the GMA X3100 graphics core can display radar PPI (planar position indicator) images on one monitor, while displaying system status and track parameter lists on another monitor. Its powerful data processing capability and graphics acceleration performance provide sufficient hardware foundation for radar software processing.

Tips for troubleshooting common engineering problems

Problem phenomenon 1: The system cannot be powered on, and the power indicator light does not light up

Key points of inspection: Confirm that the power supply to the system slot corresponding to the backplane of the CompactPCI chassis is normal. Check if the board is fully inserted and lock the pop-up device. Try replacing a system slot to troubleshoot the backplane slot issue.

Key point: cPCI-6965 only draws power from the+5V power rail. If the power supply and 5V output capability of the chassis are insufficient (especially when multiple high-power cards are inserted at the same time), it may cause voltage drop and the system cannot start. Suggest measuring whether the+5V voltage on the backplane is within the allowable range of+5%/-3% (i.e. between 4.85V and 5.25V) as per the specifications.

Problem phenomenon 2: Abnormal or garbled serial communication

Key points of inspection: Firstly, confirm the electrical interface standard (RS-232/422/485) of the connected equipment, and check whether the onboard DIP switch (SW1-SW8) is configured correctly. For RS-485 networks, check if the terminal resistors are configured correctly.

Key point: If selecting RS-422/485 mode, it should be noted that the pin definition of DB-9 connector has changed (refer to Table 4-6 in the manual). For example, in RS-422 mode, pins 1 and 2 become TXD - and TXD+, respectively, instead of DCD and RXD in RS-232 mode.

Problem phenomenon 3: Frequent restarts or crashes during system operation

Key points to check: Monitor CPU temperature through Hardware Health Configuration in BIOS. If the temperature continues to be too high (close to or exceeding 100 ° C), check if the chassis fan is faulty or if the air duct is blocked.

Key point: Confirm that the operating system and applications are configured correctly and periodically trigger the watchdog (WDT). If the application program deadlocks and WDT fails to "feed the dog" in a timely manner, it will cause hardware reset. The WDT LED status in BIOS can be used for auxiliary diagnosis.