Motorola MVME2305-900

Brief Introduction:
The MVME2305-900 is a rugged 6U VME64x single board computer based on the PowerPC or MC68EC040 architecture (depending on batch/revision), designed for mission-critical real-time applications in defense, aerospace, power SCADA, and industrial automation. It features VMEbus master/slave capability, PMC expansion slots, dual Ethernet, and battery-backed SRAM for non-volatile parameter storage.
Category:
Description
Key Technical Specifications:
  • Processor:​ Motorola MC68EC040 @ 25/33 MHz or PowerPC 603e/MPC7455 @ 300 MHz–1.2 GHz (variant dependent)
  • Cache:​ 8 KB/16 KB L1; optional L2 512 KB–2 MB; L3 up to 2 MB (PowerPC variants)
  • Memory:​ 8–32 MB DRAM (72-pin SIMM) or 256 MB–2 GB ECC DDR SDRAM (newer revisions); 1 MB battery-backed SRAM
  • Non-volatile Storage:​ 4–8 MB boot Flash; optional 256 MB–8 GB user Flash; dual-channel SCSI-2 (50-pin)
  • Bus Interface:​ VME64x, A32/D32/D64, supports 2eSST (up to 320 MB/s DMA)
  • Expansion:​ 2× PMC slots (64-bit/66 MHz PCI Mezzanine Card)
  • Network:​ 1× 10/100Base-TX Ethernet (RJ45); some variants add 1× GbE
  • Serial Ports:​ 2× RS-232/422/485 (DB-9), up to 460.8 kbps
  • USB:​ Optional 2× USB 2.0 Host (on later revisions)
  • Real-Time Clock:​ Battery-backed RTC with ±1 ppm accuracy
  • Watchdog Timer:​ 16-bit programmable hardware WDT
  • Operating System Support:​ VxWorks, QNX, Linux (PPC), LynxOS
  • Supply Voltage:​ +5 VDC ±5% (typical 3.5–6 A); auxiliary +12 V / +3.3 V as required
  • Power Consumption:​ 15–30 W typical
  • Operating Temperature:​ Commercial 0°C to +55°C; Industrial –40°C to +85°C (selected versions)
  • Dimensions:​ 233.35 mm × 160 mm × 20–45 mm (6U VME single slot)
  • Weight:​ Approx. 0.45–0.55 kg
  • Certifications:​ CE, UL, FCC, RoHS (selected batches), ATEX/IECEx (with enclosure)
  • Construction Material:​ FR4 multilayer PCB with metal stiffener bracket; conformal coating optional for harsh environments
Functional Features:
  • Deterministic interrupt response (<5 µs) for hard real-time control
  • Dual-ported memory for parallel VMEbus/CPU access
  • Hardware floating-point unit (FPU) for PID / FFT computation
  • Hot-swap capable when used with appropriate VME backplane
Typical Applications:
VME-based distributed I/O control, power substation SCADA, radar/sonar signal processing, railway signaling, legacy industrial upgrade paths.
Installation Notes:
  • Insert into standard 6U VME backplane; ensure proper P2 I/O mapping if using PMC mezzanine
  • Use ESD precautions; verify jumper settings for Flash boot source
  • Battery on board must be replaced per maintenance schedule to retain SRAM contents
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