Motorola MVME374-1 Intelligent VMEbus Ethernet Controller

Description

Product Introduction & Engineering Value

I’ve seen many legacy VME systems remain productive for decades because their communication hardware was maintained instead of replacing the entire platform. The Motorola MVME374-1 is one of those components that continues to appear in industrial control, military, telecommunications, and test equipment where VMEbus architecture is still in service.

Designed as an intelligent Ethernet controller, the MVME374-1 manages LAN communication independently of the primary processor, reducing CPU overhead while providing reliable network access through the VME backplane.

Technical Specifications

Manufacturer: Motorola

Model: MVME374-1

Product Type: Intelligent Ethernet Controller Board

System Bus: IEEE 1014 VMEbus

Primary Function: Ethernet Communication Controller

Network Interface: 15-pin AUI Ethernet Port

Bus Compatibility: VME A32/D32 Master/Slave

Processor: Motorola MC68020 (configuration dependent)

Memory: Shared DRAM (capacity varies by revision)

Front Panel Features: Status LEDs, Abort Button, Reset Button

Typical Applications: Industrial Automation, Defense Electronics, Telecommunications, Embedded Computing Platforms

Field Application & The “Trench” Experience

A semiconductor equipment manufacturer experienced intermittent communication failures between its supervisory computer and several VME-based process controllers after an aging Ethernet controller began dropping packets under heavy production loads.

Rather than redesigning the communication architecture, maintenance engineers installed a verified MVME374-1. After confirming proper VMEbus arbitration and Ethernet connectivity, production resumed without requiring modifications to the existing control software or rack configuration.

Typical applications include:

1. Wafer handling equipment communication
2. Industrial process data acquisition networks
3. Military and aerospace embedded VME computer systems

MVME374-1

MVME374-1

Transparency SOP: QA & Testing

Every MVME374-1 board is evaluated before shipment using documented inspection procedures.

• Verify part number and PCB revision.
• Inspect VME connectors for bent pins or excessive wear.
• Examine components for corrosion, overheating, or previous repairs.
• Confirm Ethernet interface operation and front-panel indicators.
• Perform power-on verification in a compatible VME chassis when available.
• Package in anti-static materials with impact-resistant protection.

The Veteran’s Tech Trap Guide

⚠️ Check the Ethernet Interface

The MVME374-1 uses a 15-pin AUI connector, not an RJ-45 port. Modern Ethernet infrastructure requires an external AUI transceiver or media converter for proper integration.

⚠️ Verify Board Revision

Different revisions may include different BIOS configurations or memory populations. Confirm the exact assembly number before ordering a replacement.

PRO TIP:

Before replacing the board, inspect the VME backplane connectors. Oxidized DIN connectors can produce communication faults that closely resemble Ethernet controller failures.

Dynamic FAQ

Q1. What is the primary functioe ?

It is an intelligent Ethernet controller board that provides LAN connectivity for Motorola VMEbus systems while reducing network processing demands on the host CPU.

Q2. e support standard RJ-45 Ethernet?

No. The board provides a 15-pin AUI interface. An external AUI transceiver is typically required for connection to modern Ethernet networks.

Q3. Can this board replace every variant?

Not always. Verify the complete model number, PCB revision, BIOS version, and hardware configuration before installation.

Q4. Is New Surplus inventory tested?

Yes. New Surplus units are visually inspected for authenticity and condition, while refurbished boards undergo functional verification using compatible VME hardware whenever practical.

Q5. Which industries commonlye ?

It is commonly found in legacy industrial automation systems, telecommunications equipment, aerospace electronics, defense applications, and scientific instrumentation built on the VMEbus platform.

Q6. Is a warranty typically available?

Yes. Most professional suppliers provide a warranty for both New Surplus and refd boards, although the warranty period varies by supplier and inventory condition.