Motorola MVME2304-900 VMEbus single-board computer processor module

Technical Features

1. The core computing unit adopts MPC604R 333MHz PowerPC processor with built-in 32KB instruction cache and 32KB data cache. Its floating-point and integer computing performance meets the demands of real-time control algorithms.
2. It is configured with 128MB ECC DRAM supporting hardware memory error correction, which avoids data read-write errors caused by electromagnetic interference in industrial environments. 5MB flash memory is equipped to solidify system firmware, bootloader and small-scale user applications.
3. Dual IEEE P1386.1 standard 32/64-bit PMC expansion slots support I/O signal output via front panel and VME backplane P2 channel simultaneously. Various PMC functional cards such as network port, serial port, analog acquisition and digital output can be freely matched to realize function expansion.
4. The bus architecture integrates Raven ASIC bridge chip for 64-bit PCI local bus and VME bus bridging. It supports high-speed data transmission of VME A32/D32/BLT64 and D64, with native VME system controller function, 4-level bus request and 7-level interrupt management to satisfy scheduling demands of multi-board cooperative operation.
5. Onboard standard peripherals: 10/100M adaptive Ethernet interface with PCI DMA high-speed transmission; asynchronous serial debug port for system debugging and program download; 8KB battery-backed NVRAM real-time clock retaining clock and configuration data after power cut; multi-channel hardware timers and independent watchdog timer to automatically reset the system under abnormal conditions for continuous equipment operation.
6. Environmental adaptability: Operating temperature ranges from 0℃ to 55℃, storage temperature from -40℃ to 85℃, relative humidity 10%~80% non-condensing, compatible with multiple environments such as machine rooms, vehicle-mounted cabinets and industrial control cabinets. Standard power supply is +5V DC, typical no-load power consumption 4A, maximum full-load power consumption 4.75A.

Model Decoding

1. MVME: Unified prefix for Motorola VME embedded processor module product line;
2. 2300: Base series code, representing PowerPlus architecture VME single-board computer product line;
3. 2304: Sub-model code, digit 4 stands for configuration specification: MPC604 processor, 128MB ECC memory, 5MB flash base storage;
4. -900: Hardware structure suffix, indicating the board is equipped with Scanbe-style compact ejector handle front panel; models without this suffix adopt standard IEEE wing-type ejector handles by default.

Product Characteristics

1. Modular expandability: Dual PMC slots support on-demand stacking of functional mezzanine cards, enabling system function upgrades without replacing the core processor board and reducing equipment iteration costs.
2. Full bus compatibility: Backward compatible with traditional VME A16/A24 addressing modes, while supporting VME64 high-speed 64-bit data burst transmission, suitable for renovation of old and new VME chassis systems.
3. High-reliability hardware protection: ECC memory error correction, hardware watchdog, power-off backup clock, wide temperature and wide humidity operation standards, designed for long-term uninterrupted operation equipment.
4. Integrated complete debugging tools: Built-in onboard debug monitor, hardware self-test, firmware burning, register reading and fault diagnosis can be completed through serial debug port without extra debugging hardware.
5. Single-slot lightweight design: All core hardware integrated on standard single-width VME board, low chassis space occupation, suitable for building high-density multi-board integrated control systems.
6. Standard mechanical structure: Standard 3U VME board dimension, P1 and P2 standard 96-pin backplane connectors, directly compatible with general VME chassis and backplanes.

Application Fields

1. Telecommunication equipment: Base station main control unit, communication gateway, signal scheduling processing equipment;
2. Industrial automation control: Large assembly line controller, distributed data acquisition unit, factory real-time monitoring host;
3. Rail transit equipment: Vehicle-mounted signal processing host, track monitoring acquisition system, subway vehicle-mounted control unit;
4. Simulation and test equipment: Hardware-in-the-loop simulation platform, industrial equipment performance test chassis, small aerospace simulation control module;
5. Military embedded control system: Radar signal preprocessing, small weapon equipment main control, ground measurement and control acquisition equipment;
6. Large medical equipment: High-precision imaging equipment control host, real-time data processing unit for medical devices.

Operation Guide

Working Principle

1. Core Computing Layer: MPC604 processor acts as the computing core, reads system programs and real-time operation data from 128MB ECC memory through dedicated processor-memory bus, accelerates data read-write via built-in cache, and completes control algorithms, data parsing and protocol operations.
2. Bus Bridge Scheduling Layer: Raven ASIC chip serves as transfer hub to realize data intercommunication among processor-memory bus, local 64-bit PCI bus and VME bus; it integrates interrupt controller and bus arbiter to allocate bus occupation permission and interrupt priority of multiple peripherals and multi-VME boards.
3. Peripheral Expansion Layer: Local PCI bus mounts onboard basic peripherals including Ethernet, serial port, timers and NVRAM; functional mezzanine cards inserted into dual PMC slots are also mounted on PCI bus, data of all expanded peripherals are transmitted to bridge chip through PCI bus and then forwarded to core processor.
4. VME Bus Interaction Layer: Bridge chip completes protocol conversion between PCI data and VME bus, the board acts as VME master device to send control instructions to other VME slave boards in chassis and read collected data; it can also work as slave device to receive scheduling instructions from other main control boards, multi-board systems realize distributed collaborative control relying on VME bus.The matched hardware watchdog continuously monitors processor operating status, if program crash or no bus data interaction lasts for set duration, watchdog automatically outputs reset signal to restart processor and ensure uninterrupted system operation; NVRAM real-time clock is powered by independent backup battery, keeps timing and retains user configuration parameters after power cut, and directly reads historical configurations to resume rapid operation after power-on.

FAQ 

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