Motorola MPC2004 BurstRAM™ Secondary Cache Module

Motorola MPC2004 | BurstRAM™ Secondary Cache Module

The Motorola MPC2004 is a specialized, high-performance 256KB BurstRAM™ secondary (L2) cache module.

It was engineered specifically for PowerPC™ platforms (PReP and CHRP architectures) to provide high-speed, burstable data access for the PowerPC 60x microprocessor family.

This module is essential for optimizing system throughput by reducing memory latency in professional workstations and embedded industrial controllers.

Technical Parameter Table

Product Advantages and Features

PowerPC Optimization: Tailored to match the burst protocols of the PowerPC 60x bus, ensuring seamless “flow-through” data I/O.

Burst Mode Support: Features an on-chip burst counter that allows the module to handle rapid-fire data requests without constant address cycles.

Error Correction Ready: The 72-bit wide architecture provides the extra bits required for parity or ECC (Error Correction Code) to maintain data integrity.

Low Loading Design: Utilizes multiple clock pins to reduce electrical loading on the system bus, preserving signal quality at higher frequencies.

Rugged FR4 Construction: Built on high-quality, multilayer FR4 printed wiring boards with dedicated power and ground planes for superior noise immunity.

Application Cases

Industrial Embedded Computers: Used in high-end VMEbus single-board computers (SBCs) to accelerate real-time processing tasks.

Legacy Workstations: Serving as a critical cache upgrade for PowerPC-based desktop systems running AIX or early Windows NT for PowerPC.

Automation Controllers: Integrated into complex DCS (Distributed Control Systems) where high-speed logic and data pre-fetching are required.

Network Infrastructure: Used in mid-range routing and switching equipment that utilizes the PowerPC architecture for control plane management.

Other Models in the Same Series

The MPC200x family offers a clear upgrade path based on capacity and speed:

MPC2005: 512KB variant (64K x 72 bits).

MPC2006: 1MB Synchronous variant for high-demand CHRP platforms.

MPC2007 / MPC2009: Asynchronous cache module versions (256KB and 1MB).

MPC2104 / MPC2105: 3.3V-only versions for newer, low-power system designs.

Installation and Maintenance

Installation: Align the 182-pin module with the DIMM socket on the motherboard or carrier card. Ensure the module is fully seated until the retaining clips snap into place.

Voltage Verification: Critical: This module requires both 3.3V and 5V power rails. Verify that your system backplane or motherboard supports this dual-voltage configuration before installation.

Electrostatic Safety: Always handle the module by its edges and use an ESD-safe wrist strap. The high-speed SRAM chips are extremely sensitive to static discharge.

Diagnostics: Most Motorola VME systems (like the MVME series) include “Power-Up Self-Test” (PUST) firmware that will automatically detect and test the MPC2004 cache during boot-up.

Unique Product Description

The Motorola MPC2004 represents a bridge to the era of high-speed RISC computing.

It is more than just a memory stick; it is a precision-timed “acceleration engine” for the PowerPC ecosystem.

By offloading the most frequent memory requests to this 9ns module, systems can achieve deterministic performance that modern, generic RAM cannot replicate.

For engineers and technicians maintaining mission-critical legacy infrastructure, the MPC2004 remains a vital component for ensuring system stability and speed.