MOTOROLA MPC2004

Manufacturer Background: Original Motorola Semiconductor Products Sector (later Freescale Semiconductor). MPC2004 is a dedicated synchronous BurstRAM secondary cache expansion DIMM module designed exclusively for Motorola PowerPC 60x series processors, fully compliant with PReP (PowerPC Reference Platform) and CHRP (Common Hardware Reference Platform) industrial embedded standards. Widely matched with MVME PowerPC single board computers (MVME2600, MVME5500, MVME6100) to boost CPU burst data throughput, deployed in aerospace, military radar, power plant DCS, industrial real-time signal processing equipment. Works with dual 3.3V I/O / 5V core power architecture, supports parity/ECC data integrity protection.

Part Number Breakdown: MPC2004 - MPC: Motorola PowerPC Cache unified product prefix - 2004: Standard 182-pin DIMM BurstRAM L2 cache module hardware model Suffix definition: No suffix = standard 256KB base capacity; optional variants support 512KB extended cache Comparative models: MPC2005 (higher density 512KB base cache DIMM), MPC2001 (low-speed 33MHz cache module)

Product Type: 182-pin edge connector DIMM synchronous secondary cache expansion memory module; BurstRAM high-speed synchronous SRAM architecture, 32K×72-bit data width supporting parity/ECC error correction, integrated on-die burst counter for PowerPC burst protocol flow-through transmission, dual voltage (3.3V LVTTL I/O +5V core), tag RAM with valid/dirty status bits, byte-write access support, max 66MHz clock frequency, compatible with all PowerPC 60x embedded SBC motherboards following PReP/CHRP rules.

Matching System Components: Motorola PowerPC 60x CPU (MPC7400/7410/7457); MVME series VME single board computers (MVME2600, MVME5500, MVME6100); PReP/CHRP compliant embedded mainboard; Dual output industrial power supply (+3.3V, +5V); VxWorks/Embedded Linux real-time OS supporting PowerPC cache configuration; VME rack embedded chassis; memory extraction/installation tooling.

Core Hardware Overview: 1. Cache Memory Architecture - Data RAM: Four Motorola 32K×18 BurstRAM chips, 32K×72-bit total width (64 data bits + 8 parity/ECC bits) - Tag RAM: 16K×12-bit tag storage + 16K×2-bit valid/dirty state flag memory - Standard capacity: 256KB L2 cache; expandable variant reaches 512KB - Access timing: Data RAM 9ns access speed, Tag RAM match latency 10ns 2. Bus & Clock Circuit - Maximum synchronous clock: 66MHz, multi-clock pin layout to reduce bus load - Native PowerPC burst counter on-module, seamless flow-through burst data transmission - All I/O signals LVTTL 3.3V compatible, three-state output control for multi-module sharing - Byte granular write operation support for partial cache data update 3. Electrical Specifications - Dual power supply requirement: 3.3V for all I/O interfaces, 5V for internal SRAM core logic - Typical operating current: 1.2A @5V, 0.35A @3.3V under full 66MHz load - ESD protection: ±8kV HBM human body model for all edge connector pins 4. Mechanical & Environmental Ratings - Form Factor: 182-pin (91×2 double row) edge connector DIMM card, standard embedded memory module size - Operating Temperature: 0°C ~ +70°C standard industrial; conformal coated rugged variant -40°C ~ +85°C - Storage Temperature: -55°C ~ +125°C - Humidity: 5%~95% RH non-condensing - Vibration & Shock: IEC 60068 industrial embedded standard, CE certified

1. Product Overview

MPC2004 is Motorola’s dedicated L2 secondary cache expansion DIMM exclusively built for PowerPC 60x embedded processors, complying with PReP and CHRP open embedded hardware standards. It adopts high-performance BurstRAM synchronous SRAM, providing 256KB standard secondary cache to drastically lift burst data bandwidth of PowerPC-based VME single board computers such as MVME5500 and MVME6100. The 72-bit wide memory architecture reserves 8 extra bits for parity or ECC error correction, effectively eliminating cache data corruption caused by industrial electromagnetic radiation and signal interference, ensuring stable long-cycle operation of mission-critical equipment like radar signal processing and power plant DCS master control units. The integrated on-board burst counter perfectly matches PowerPC native burst transmission protocol, achieving uninterrupted flow-through data I/O without repeated address cycle overhead, greatly improving real-time computing response speed for floating-point algorithm tasks. Dual 3.3V/5V power design matches the power rail layout of all classic Motorola PowerPC VME SBCs; the standard 182-pin DIMM form factor enables plug-and-play installation without chassis modification. Optional conformal coated wide-temperature variant supports deployment in military, marine and outdoor harsh environments, widely used as standard upgrade spare memory for aging MVME VME control rack renovation projects. Fully compatible with mainstream real-time operating systems VxWorks and Embedded Linux, with complete cache configuration driver support for embedded development.

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