XYCOM XVME-675 Industrial-grade VMEbus PC/AT Processor Module - Detailed Product Description

I. Product Overview

XYCOM XVME-675 is a single-slot 6U specification, PC/AT compatible high-performance VMEbus processor module. It is designed and manufactured by XYCOM (now part of Acromag/Xembedded), targeting demanding applications such as industrial control, embedded real-time systems, military/aerospace, and high-reliability measurement and control. It integrates the robust industrial architecture of VMEbus with the rich software ecosystem of IBM PC/AT, featuring a 100 MHz 80486DX4 processor, 32-bit VME master-slave interface, SVGA graphics, dual serial ports, IDE/floppy drive control, and PC/104 expansion capabilities. It is the mainstream main control unit for mid-to-high-end legacy VME systems.

II. Core Functions and Features

(1) 100 MHz 486DX4 High-performance Processor, Built-in Floating Point and Cache

Equipped with Intel 80486DX4-100 MHz processor, performance is approximately 50% higher than 486DX2.

Includes 16KB on-chip cache and hardware floating-point unit (FPU), supporting virtual memory management, 32-bit internal architecture, suitable for complex calculations and real-time control.

Utilizes SL energy-saving process, optimized power consumption, suitable for long-term operation in enclosed, fanless chassis.

P24T/P24CT compatible CPU socket, can smoothly upgrade to early Pentium processors, protecting investment.

(2) Large-capacity DRAM, Zero Wait Access

Board-mounted 16MB or 32MB DRAM (optional), dual-channel architecture.

Memory controller with four-level double-word buffering, write operations with zero wait state, significantly improving system response and graphics performance.

Optional Shadow RAM for BIOS and VGA BIOS mapping, further accelerating system startup and call.

(3) Super VGA Graphics Controller, 1MB Video Memory, High Resolution

Integrated Super VGA controller, equipped with 1MB high-speed video RAM.

Includes FIFO, video write operations with zero wait state; supports hardware cursor and BitBLT engine, smoother GUI display.

Resolution up to 1280×1024 (256 colors) or 1024×768 (64K colors), front panel DB15 interface directly connects to the monitor, suitable for industrial monitoring and local operation.

(4) Complete Storage Interfaces: IDE + Floppy Drive, Flexible Expansion

IDE hard disk controller: supports dual drive cascading, can connect 2.5-inch IDE hard drives, SSDs, for system and data storage.

Floppy drive controller: compatible with 360KB to 1.44MB standard floppy drives, suitable for old media and system recovery.

Board-mounted firmware Flash stores BIOS and configuration parameters, power-off data preservation, supports remote upgrade.

(5) Complete VMEbus Interfaces: 32-bit Master-Slave, Interrupt and Arbitration

Complies with VMEbus IEEE 1014-1994, supports A16/A24/A32 addresses, D08/D16/D32 data transmission.

Full 32-bit master/slave mode, supports dynamic interrupts, programmable byte exchange, single-level arbitration, R0-R3 bus requests, can drive SYSCLK/SYSRESET. Provide 7-level VME interrupts and ring buffer processing, efficiently responding to multi-module events, and adapting to complex multi-I/O systems.

Support the function of VMEbus slot 1, which can be used as a system controller to manage the resources of the entire chassis.

(6) Rich onboard I/O, ready to use without expansion cards

Serial port: 2 channels of RS-232C, up to 115.2kbps, can be connected to terminals, PLCs, sensors.

Parallel port: 1 channel of EPP/ECP parallel port, suitable for printers, scanners or dedicated equipment.

Keyboard / Mouse: PS/2 composite interface, supports standard PC peripherals, facilitating local debugging.

Watchdog timer (WDT): hardware-level monitoring, automatic reset in case of abnormality, preventing system from crashing, enhancing long-term operational reliability.

(7) PC/104 expansion and reinforced design

Reserved PC/104 expansion slot, can be stacked with PC/104 modules (such as serial ports, network cards, motion control), flexible expansion of functions.

Industrial-grade wide temperature range: standard 0℃～55℃, reinforced version **-40℃～+70℃**, suitable for extremely cold / hot, humid, dusty environments.

Anti-vibration / shock: complies with MIL-STD-810, vibration 5g, shock 50g, suitable for mobile scenarios such as vehicle-mounted, airborne, and ship-mounted.

High EMI anti-interference: complies with CE/FCC/UL and EN 61000-6-2/4, stable operation in strong electromagnetic environments.

III. Technical Specifications

Processor: Intel 80486DX4-100 MHz, 16KB L1 cache, built-in FPU

Memory: 16MB/32MB DRAM (optional), zero wait write

Graphics: Super VGA, 1MB VRAM, up to 1280×1024

Storage: IDE (dual disks), floppy drive (360KB～1.44MB), Flash BIOS

Serial port: 2×RS-232 (115.2kbps)

Parallel port: 1×EPP/ECP

VMEbus: A16/A24/A32, D08/D16/D32, master / slave, 7-level interrupts, arbitration

Expansion: PC/104 slot

Power supply: +5V, ±12V (VME backplane power supply)

Power consumption: typical + 5V approximately 4.9A, +12V approximately 4.2A

Operating temperature: 0℃～55℃ (standard); -40℃～+70℃ (reinforced)

Storage temperature: -55℃～+85℃

Humidity: 5%～95% (non-condensing, 60℃)

Size: 6U single slot (233mm×160mm)

Weight: approximately 0.6kg

IV. Typical Application Scenarios

Industrial automation main control: production lines, process control, DCS system core controller, managing I/O modules and complex logic.

Embedded real-time systems: robots, CNC machines, rail transit, etc., scenarios requiring high real-time performance and stability.

Military / aerospace: mobile harsh environments such as vehicle-mounted, airborne, and ship-mounted, requiring anti-vibration, wide temperature, and highly reliable control units.

Measurement and control and data acquisition: multi-channel signal acquisition, processing, and storage, suitable for precise testing, equipment monitoring, laboratory instrument control.

Upgrade of old VME systems: compatible with standard VMEbus, replacing old CPU modules, protecting existing I/O and chassis investment, enhancing performance.

V. Summary of Product Advantages The XVME-675 boasts several core advantages: operating at 100 MHz with a 486DX4 processor and a FPU, 16MB/32MB zero-latency memory, 1MB SVGA graphics memory, dual storage via IDE and floppy drives, 32-bit VME master-slave interface, dual serial ports + parallel ports + PS/2, PC/104 expansion, wide temperature resistance and high immunity to interference. It achieves an excellent balance among performance, stability, compatibility and scalability. It inherits the PC/AT software ecosystem, with low development and porting costs; the VMEbus interface is complete, suitable for complex industrial systems; the onboard interfaces are abundant, requiring no additional expansion cards; the reinforced design is adaptable to harsh environments, making it the preferred choice for high-reliability and long-life cycle main control modules of mid-to-high-end legacy VME systems.