The Emerson/Motorola PM604 is a VMEbus processor mezzanine module built on the PowerPC 604™ microprocessor architecture, designed for industrial, military, and aerospace control systems. It integrates 32-bit processing, configurable memory expansion, and PCI-based connectivity to serve as a core computing element within MVME3600 and MVME4600 host platforms.
## Technical Specifications
**Processor**
• PowerPC 604™ microprocessor core
• 32-bit or 64-bit architecture
• Clock speeds: 133 MHz, 200 MHz; up to 400 MHz for 604e variants
• Internal clock multiplier: 1x, 1.5x, 2x, and 3x SYSCLK
• On-chip cache: 32 KB (16 KB instruction, 16 KB data)
**Memory**
• Flash: 1 MB onboard (150 ns access, two 512K × 8 banks), programmable
• DRAM: Up to 64 MB onboard ECC or up to 1 GB via mezzanine expansion modules (RAM104, RAM201)
• Memory organization: Two independent banks with 8-4-4-4 read/write burst support
• No interleaving
**Interfaces & Connectors**
• 64-bit PCI connection to base I/O modules
• Separate PCI connector for expansion carriers (Motorola PMCspan compatible)
• VME64 environment operation
• Mezzanine connectors for memory expansion modules
• IEEE P1386.1 compatible PMC expansion slots (related architectures)
**Bus & Control**
• MPC105 bridge/memory controller
• External bus frequency: up to 66 MHz
• PCI frequency support specified
## Key Features
• Modular mezzanine design for processor and memory upgrades
• Configurable clock multiplier enables flexible timing in host systems
• Dual-bank DRAM organization supports burst operations
• Optional ECC protection for mission-critical applications
• On-board Flash programmability for firmware storage
## Typical Applications
Industrial process control, military systems integration, aerospace data handling, and complex monitoring architectures requiring PowerPC performance with memory scalability.
## Compatibility & Integration
Plugs into MVME160x Single Board Computers. Mates with MVME3600 and MVME4600 base I/O modules to form complete board-level computer systems. Optional transition modules (MVME760, MVME712M) enable peripheral connectivity.
