I. Product Introduction

MVME167‑004A is a 6U VME single-height industrial single-board computer (SBC) from Motorola/Emerson. It is the highest memory configuration version A of the MVME167 series; 004A = 25MHz + 32MB DRAM. It is fully compatible and directly interchangeable with 001A/002A/003A/003B in terms of pins, mechanics and interfaces.

Application: It is targeted at industrial embedded scenarios with high load, large data volume and complex control algorithms. It is the 32MB high-end version of MVME167‑003A.

II. Core Hardware Parameters (Using Parameters)

1) Processor

Model: MC68040RC25, 25MHz

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

2) Memory (Key: Maximum for all models in the A series)

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

SRAM: 128KB battery backup (power-off 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 across 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

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

Power Consumption: Higher than 001A/002A/003A, due to 32MB DRAM

5) Structure and Weight

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

Weight: Approximately 0.7kg

III. Memory Overview of MVME167 A Series (Comparison)

001A: 4MB

002A: 8MB

003A: 16MB

004A: 32MB (maximum A series)

IV. Typical Applications

Industrial automation, motion control, data acquisition, complex algorithms / large data processing, standard VME high-load scenarios requiring 32MB memory.