I. Product Introduction

MVME167‑004B is a 6U VME single-height industrial single-board computer (SBC) from Motorola/Emerson. It is the B revision of MVME167‑004A (function/connector fully compatible, direct replacement).

Core Feature: 25MHz + 32MB parity DRAM + enhanced anti-interference / ESD / stability. It is the highest memory and highest reliability standard 25MHz model in the MVME167 series.

II. Core Hardware Parameters (Usage Parameters)

1) Processor

Model: MC68040RC25, 25MHz

Architecture: 32-bit, built-in FPU (hardware floating point), 8KB L1 cache, MMU

2) Memory (Maximum Standard Configuration for the Entire Series)

DRAM: 32MB 32-bit parity (standard, non-expandable)

SRAM: 128KB battery backup (data retention during power loss)

Flash/ROM: 4×44-pin PLCC, 2×32-bit storage units

NVRAM/RTC: 8K×8 NVRAM + real-time clock (battery backup)

3) Built-in I/O Interfaces (Consistent with the Series)

Ethernet: 10Mbps 10BASE-T/AUI, DMA

Serial Port: 4×EIA-232-D (1 controller + 3 users), up to 115200bps

SCSI-2: single-ended, DMA, 20MB/s, supports 7 external devices

Parallel Port: 1×IEEE 1284 bidirectional

VME Bus: A32/D32, master / slave / system controller

Expansion: PMC Expansion Slot (optional)

Timer / Watchdog: 6×32-bit programmable timer + hardware WDT

4) Electrical and Environmental (Enhanced B Version)

Power Supply: +5V DC ±5%, typical 3.5A, maximum 4.5A

Operating Temperature: 0℃～+55℃ (Standard Model)

Storage Temperature: -55℃～+125℃

Cooling: Forced air cooling, approximately 100CFM

Reliability: B Version optimized PCB, ESD protection, anti-interference, firmware update, more stable in harsh conditions

5) Structure and Weight

Size: 6U VME (233.4×160mm), single height

Weight: Approximately 0.7kg

III. MVME167-004A vs 004B (3 Key Differences)

Stability: 004B enhanced ESD / surge / anti-interference, suitable for humid, dusty, and strong electrical interference environments

Firmware: 004B pre-installed updated version 167Bug, better compatibility and long-term stability

Hardware Process: 004B PCB wiring and component layout optimization, fault rate lower than 004A

IV. Memory Overview of MVME167 A/B Versions (25MHz Series)

001A/B: 4MB

002A/B: 8MB

003A/B: 16MB

004A/B: 32MB (Top Configuration for 25MHz)

V. Typical Applications

Industrial automation, motion control, machine vision, data acquisition, complex algorithms / large data volume, harsh conditions, high-reliability VME scenarios requiring 32MB memory.