I. Product Introduction

MVME167‑003B is a 6U VME single-height industrial single-board computer (SBC) launched by Motorola/Emerson. It is an upgrade of MVME167‑003A (revision B), with pin, mechanical and interface compatibility and direct interchangeability with 001A/002A/003A/004A. Core positioning: 25 MHz CPU + 16MB standard memory + enhanced reliability, targeting embedded scenarios with medium load, high stability, and long-term operation in industrial automation, data acquisition, motion control, etc.

1) Processor

Model: MC68040RC25 (25 MHz)

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

2) Memory (Key Differences)

DRAM: 16MB 32-bit parity (standard), up to 32MB expandable

SRAM: 128KB battery backup (power-on data retention)

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 user), up to 115200bps

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

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 type)

Storage Temperature: -55℃～+125℃

Cooling: forced air cooling, approximately 100CFM

Reliability: B version optimized PCB routing, ESD protection, anti-interference, long-term stability superior to 003A

5) Structure and Weight

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

Weight: approximately 0.7kg

Three, Core Differences between 003A and 003B (3 points)

Memory: 003A = 16MB (optional 32MB); 003B = 16MB (hardware optimization, more stable)

Reliability: 003B ESD / anti-interference / PCB strengthening, suitable for harsh environments

Firmware: 003B pre-installed updated version 167Bug, better compatibility and stability

Four, Typical Applications

Industrial automation, data acquisition, motion control, embedded systems, standard VME control scenarios requiring 16MB memory + high stability