The Mercury Computer Systems P2A64B-D is a RACE++ switched fabric interconnect daughtercard that enables high-performance communication between processing nodes in embedded computing systems. It connects compute nodes to the RACEway network via an interface FPGA, delivering direct and unblocked access across the fabric architecture. The card uses crossbar switching for both onboard and inter-board communication paths, supporting efficient data exchange between compute nodes, memory nodes, and I/O nodes.
Technical Specifications
Processor Configuration
• Dual MPC7447A PowerPC processors
• Clock speed: 800 MHz (standard); 667 MHz (extended temperature range)
• AltiVec™ vector execution unit operating on 128 bits concurrently
• Floating-point unit and four integer execution units
• L1 cache: 32 KB instruction, 32 KB data per processor
• L2 cache: 512 KB, eight-way set-associative per processor
Memory Subsystem
• DDR-266 133-MHz Double Data-Rate SDRAM
• On-chip error-correcting circuitry: single-bit correction, multi-bit error interrupt
• Virtual mapping registers for address window granularity and simultaneous SMB connections
• FIFO buffering for overlapped local and remote SDRAM access
Interconnect Performance
• RACEway fabric bandwidth: 267 MB/s per crossbar connection
• Aggregate crossbar bandwidth: exceeds 1 GB/s (four simultaneous 267 MB/s paths)
• RACEway Interlink: multiple 160-Mbyte/sec data paths with aggregate bandwidth exceeding 1 Gbyte/sec
Architecture
• RACE++ switched fabric interconnect
• Integrated compute node (CN) interface combining memory control and network interface functions
– Key Features
• Direct, unblocked node access to RACEway fabric eliminates communication bottlenecks
• Concurrent floating-point and integer execution with parallel vector processing
• Memory controller integrated with network interface for efficient dual-path access
• Crossbar architecture supports multiple simultaneous communication paths
– Compatibility & Integration
Designed for Mercury Computer Systems RACE++ Series PowerPC product family. Operates within Mercury’s RACEway switched fabric ecosystem for distributed embedded computing architectures.
