Description
Motorola MPC2004
Technical Specifications:
- Brand: Motorola
- Model: MPC2004
- Capacity: 256KB / 512KB
- Data Width: 32K x 72 or 64K x 72 bits
- Package Format: 182-pin (91 x 2) Dual In-line Memory Module (DIMM)
- Operating Voltage: Requires both 5V and 3.3V dual power supplies
- Maximum Clock Frequency: 66 MHz
Functional Features:
- On-Chip Burst Counter: Integrates a PowerPC-style burst counter, supporting burst operations initiated by the SRAMADS signal, with subsequent addresses automatically generated internally by the SRAMCNTEN signal.
- Flow-Through Data I/O: Utilizes a flow-through architecture to optimize data read efficiency.
- Byte Write Capability: Provides eight write enable pins for precise byte-level write control.
- Plug-and-Play Support: Equipped with Presence Detect pins to support automatic configuration of cache control parameters.
- Multiple Clock Pins: Designed with multiple clock pins to reduce loading and improve signal integrity.
Application Scenarios:
Primarily used in PReP and CHRP platforms based on the PowerPC 60x architecture as a core secondary cache component for high-performance computing, network equipment, and industrial control systems.
Performance Parameters:
- Tag RAM Match Access Time: 10 nanoseconds
- Data RAM Access Time: 9 nanoseconds
- I/O Level Compatibility: All cache data and tag I/Os are LVTTL (3.3V) compatible, supporting three-state outputs.
Material Composition:
Constructed using high-quality multi-layer FR4 printed wiring boards (PWB) with separate power and ground planes. Each fast static RAM is equipped with decoupling capacitors to ensure clean power delivery.
Structural Characteristics:
Features a 182-pin card edge connector (Burndy connector, part number ELF182JSC-3Z50) with excellent resistance to vibration and shock, making it suitable for industrial-grade deployment.
Working Principle:
The module initiates cache read or write cycles by receiving burst request signals from the processor. Internal BurstRAM chips automatically increment addresses and cooperate with high-speed tag RAM for data comparison, thereby providing high-frequency data exchange for the PowerPC processor in an extremely short time.
Installation Requirements:
It must be inserted vertically into the designated 182-pin DIMM slot on the motherboard, ensuring the retaining clips are fully locked. The system motherboard must provide stable 5V and 3.3V dual power supplies.
Precautions for Use:
This module is an electrostatic discharge (ESD) sensitive device; an anti-static wrist strap must be worn during handling. Never insert or remove the module while the system is powered on, and ensure both power supplies are connected simultaneously, otherwise the module will not function properly.
