Description
1. Overview
The GE VME-PMC-CADDY is a 6U VME64 standard PMC carrier board designed for VME bus industrial control systems. Adopting Tundra UNIVERSE II CA91C142 high-performance VME-PCI bridge chip, it realizes bidirectional protocol conversion and data transparent transmission between VME bus and PMC mezzanine card bus.
Compliant with IEEE P1386 and IEEE 1014 Rev.D industrial standards, the module supports 2 single-size or 1 double-size PMC module installation, compatible with VME64/VME64x full bus functions and master/slave dual operating modes. Featuring wide-temperature rugged design, rear I/O routing and multi-level interrupt mapping, it is widely used in power plant turbine control systems, embedded measurement and control equipment, and industrial automatic control system function expansion and technical renovation scenarios.
2. Technical Features
2.1 VME/PMC Bidirectional Bus Bridging
Built-in industrial-grade UNIVERSE II CA91C142 bridge chip realizes seamless protocol intercommunication and low-latency data forwarding between VME bus and PMC PCI bus. It eliminates the need for additional protocol conversion equipment, ensures high-synchronism data interaction, and meets real-time transmission requirements of industrial control systems.
2.2 Flexible Multi-Spec PMC Expansion
Supports flexible installation of 2 single-size PMC modules or 1 double-size PMC module, compatible with various functional PMC cards such as communication, data acquisition and serial interface modules. It quickly expands customized functions for legacy VME systems without replacing the main control board and rack, greatly improving system scalability.
2.3 Full VME64 Bus Compatibility
Fully compliant with VME64/VME64x specifications, supporting A32/D32 high-speed 32-bit data transmission and 4-level bus arbitration. It works in both VME master and slave modes, perfectly matching GE VME series SBCs and standard 6U VME backplanes with zero compatibility barriers.
2.4 Rear I/O Routing Design
PMC I/O signals are routed and output through the VME P2 rear connector, realizing standardized and tidy cabinet wiring. It effectively reduces on-site signal crosstalk and cable disorder, facilitating system integration, on-site debugging and daily maintenance.
2.5 Ultra-Wide Temperature Rugged Industrial Design
Adopts military-grade reinforced aluminum alloy structure and three-proof PCB technology. The operating temperature ranges from -40℃ to +70℃, supporting 95% non-condensing humidity environment. It features excellent vibration resistance, impact resistance and EMC anti-interference performance, adapting to harsh continuous industrial operating conditions.
2.6 Multi-Level Interrupt Mapping & Stable Scheduling
Supports mapping PMC module interrupts to any of the 7 VME bus interrupt lines with configurable priority. It ensures accurate interrupt response without loss or false triggering, avoiding bus conflicts and program exceptions during parallel operation of multiple expansion modules.
2.7 Debug Interface & Convenient Maintenance
Equipped with dedicated JTAG debug interface and hardware status monitoring interface, supporting underlying firmware debugging and real-time link status detection. Complete software driver libraries support system configuration adaptation and firmware iteration, reducing on-site debugging and operation costs.
3. Detailed Specifications
3.1 Basic Hardware Parameters
- Model: VME-PMC-CADDY
- Manufacturer: GE / ESD Electronics
- Type: 6U VME Bus PMC Carrier Expansion Board
- Compliance Standard: IEEE P1386, IEEE 1014 Rev.D
- Core Chip: Tundra UNIVERSE II CA91C142 VME-PCI Bridge
- PMC Loading Capacity: 2×Single-size PMC / 1×Double-size PMC
- Bus Specification: VME64 / VME64x, A32/D32 Address & Data Bus
- Operation Mode: VME Bus Master / Slave Dual Mode
- Core Functions: Bus Bridging, Protocol Conversion, I/O Routing, Interrupt Mapping, Bus Scheduling
- Applicable System: Full Series 6U VME Architecture Industrial Control System
- Application Fields: Power Plant Turbine Control, Embedded Measurement, Industrial Automation, Test Equipment
3.2 Bus & Electrical Parameters
- Bus Transmission: 32-bit High-Speed Data Transmission, A32 High-Address Addressing
- Bus Arbitration: 4-Level VME Bus Arbitration Mechanism
- Interrupt Mapping: 7-Level VME Bus Interrupt Configurable Priority
- I/O Routing: PMC Signal Output via VME P2 Rear Connector
- Debug Port: JTAG Debug Interface + Hardware Status Monitoring Interface
- Power Supply: Standard VME Backplane DC Power Supply
- Protection Design: EMC Anti-Interference, Signal Filtering, Surge Suppression
3.3 Mechanical & Installation Parameters
- Structure: Standard 6U VME Eurocard Rack Mount
- Connector: Dual 160-pin VG Industrial Standard Connector
- Material: Reinforced Aluminum Alloy Frame + Industrial Three-Proof PCB
- Installation: Embedded Installation for Standard 6U VME Rack
3.4 Environmental Parameters
- Operating Temperature: -40℃ ～ +70℃
- Storage Temperature: -55℃ ～ +85℃
- Operating Humidity: 5%～95%RH (Non-Condensing, Non-Corrosive)
- Environmental Resistance: Vibration-Proof, Impact-Proof, Humidity-Proof, EMC Anti-Interference
- Working Condition: Power Plant Cabinet, Industrial Workshop, Field Measurement and Control
- Execution Standard: IEEE Industrial Bus Standard, GE Industrial Hardware Specification
4. Operating Principle
The GE VME-PMC-CADDY operates based on VME-PCI hardware bridging, protocol conversion, interrupt mapping scheduling and rear I/O routing. After power-on self-check and initialization, the module completes bus protocol matching, interrupt line mapping and peripheral enumeration, establishing stable bidirectional communication between VME main control bus and PMC sub-card bus.
During system operation, the CA91C142 bridge chip parses and converts data instructions between VME bus and PMC PCI bus, realizing low-latency two-way transparent transmission. The built-in 4-level bus arbitration mechanism reasonably allocates bus resources to avoid data conflicts during parallel operation of multiple PMC modules. PMC interrupt signals are accurately mapped to VME bus channels to ensure timely and effective system response to device exceptions.
All PMC I/O signals are output through the rear P2 connector for standardized wiring and signal isolation. The real-time hardware monitoring function tracks bus status and data transmission quality, ensuring coordinated and stable operation of VME main control system and extended PMC sub-cards, and realizing zero-renovation function expansion and performance upgrading of legacy VME systems.
5. Application Scenarios
1. Function expansion and performance upgrading of legacy VME industrial control systems such as power plant turbine control systems.
2. Compatible adaptation of various single/double-size standard PMC functional sub-cards to expand system interfaces and functions.
3. Technical renovation and precision improvement of industrial embedded measurement and control equipment and high-end test instruments.
4. Fault replacement and daily maintenance of aging and discontinued VME bus expansion carrier boards.
