II. Core Hardware Parameters (Using Parameters)

1) Processor

Model: MC68040RC33, 33 MHz

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

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

2) Memory (Minimum Standard for 33 MHz Series)

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

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 across the series)

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

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

SCSI-2: Single-ended, DMA, 20MB/s, supports 7 peripheral 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 Slightly Higher for 33 MHz)

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 100 CFM

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

5) Structure and Weight

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

Weight: Approximately 0.7kg

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

031A: 4MB (entry-level)

032A: 8MB

033A: 16MB

034A: 32MB (33 MHz top-of-the-line)

IV. Brief Differences between 031A and 031B

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

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

V. Typical Applications

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

MVME167‑031B is a 6U VME single high industrial single-board computer (SBC) from Motorola/Emerson, being the B revision (function / pin / mechanical fully compatible, direct replacement) of MVME167‑031A.

Positioning: 33 MHz high performance + 4MB parity DRAM + enhanced anti-interference / ESD / long-term stability, is the entry-level high-reliability model of MVME167 33 MHz series, suitable for harsh conditions, strong interference, and long-term stable operation VME systems.

II. Core Hardware Parameters (Usage Parameters)

1) Processor

Model: MC68040RC33, 33 MHz

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

Performance: Approximately 30% higher instruction throughput than 25 MHz 004A, with more significant improvement in floating-point performance

2) Memory (Minimum for 33 MHz 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: 10 Mbps 10BASE-T/AUI, DMA

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

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 in B Version, 33 MHz Power Consumption Slightly Higher)

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 100 CFM

Reliability: B Version optimized PCB routing, ESD protection, surge suppression, anti-interference design, updated 167Bug firmware, failure rate significantly lower than 031A

5) Structure and Weight

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

Weight: Approximately 0.7kg

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

031B: 4MB (entry-level high reliability)

032B: 8MB

033B: 16MB

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

IV. 031A vs 031B (4 Key Differences)

Stability: 031B enhanced ESD / surge / anti-interference, suitable for humid, dusty, and strong electrical interference environments

Firmware: 031B pre-installed updated version 167Bug, better compatibility and long-term stability

Hardware Process: 031B PCB routing and component layout optimized, fault rate lower than 031A

V. Typical Applications

Industrial automation, motion control, machine vision, data acquisition, systems requiring 33 MHz high real-time computing power but with limited memory requirements (≤4MB), harsh conditions, long-term unmanned operation, VME systems.