I. Product Introduction

MVME167‑031A is a 6U VME single-height industrial single-board computer (SBC) from Motorola/Emerson. It belongs to the 33MHz high-performance series of MVME167;

031A = 33MHz + 4MB parity-check DRAM, fully compatible and directly interchangeable with 032A/033A/034A/031B/032B/033B/034B pin / mechanical / interface.

Positioning: 33MHz high-speed entry-level model, 4MB basic memory, suitable for VME systems with medium-low load but requiring higher CPU computing power.

II. Core Hardware Parameters (Using Parameters)

1) Processor

Model: MC68040RC33, 33MHz

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

Performance: Approximately 30% higher instruction throughput than 25MHz 004A

2) Memory (Minimum Standard for 33MHz Series)

DRAM: 4MB 32-bit parity (standard), expandable to 32MB

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 across 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 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 Consumption is slightly higher for 33MHz)

Power Supply: +5V DC ±5%, typical 4.0A, maximum 5.0A

Operating Temperature: 0℃～+55℃ (standard type)

Storage Temperature: -55℃～+125℃

Cooling: Forced air cooling, approximately 100CFM

Power Consumption: Approximately 20W (typical), higher than 25MHz series

5) Structure and Weight

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

Weight: Approximately 0.7kg

III. Memory Overview of MVME167 33MHz A Version (Comparison)

031A: 4MB (entry-level)

032A: 8MB

033A: 16MB

034A: 32MB (top configuration for 33MHz)

IV. Brief Differences between 031A and 031B

031A: Standard version, basic firmware, suitable for conventional industrial environments

031B: Enhanced version, optimized PCB/ESD/anti-interference, updated 167Bug firmware, more stable in harsh conditions

V. Typical Applications

Industrial automation, motion control, data acquisition, VME systems requiring 33MHz computing power but with limited memory requirements (≤4MB), medium to high real-time control scenarios.