The Performance Technologies PT-VME 910N is a 32-bit VMEbus repeater that buffers and compensates timing for interfaces connecting two VMEbus-compatible card cages. It extends VMEbus reach and drive capability through a Host and Non-Host interface board configuration interconnected by four standard 50-pin flat cables, enabling expanded system connectivity without signal degradation.
Technical Specifications
VMEbus Compliance & Data Transfer
• VMEbus Specification Revision C conformance
• 32-bit data bus width
• A32, D32 addressing and data compatibility
• Supports byte/word/longword aligned and unaligned data transfers
• Read-modify-write cycles, sequential block cycles, and address pipelining
Signal Timing (6-foot cables)
• AS (RD/WR): 115 ns typical, 135 ns maximum
• DSx (RD): 135 ns typical, 155 ns maximum
• DSx (WR): 190 ns typical, 215 ns maximum
• DTACK (RD): 100 ns typical, 120 ns maximum
• DTACK (WR): 35 ns typical, 50 ns maximum
Electrical Requirements
• +5 Vdc ±5% per board
• 3.8 A typical, 5.8 A maximum per board
– Key Features
• Buffered interface architecture for extended VMEbus load capacity
• Bidirectional interrupt channel: Seven (7) levels (IH1-IH7) with IACK daisy-chain driver
• Four (4) arbitration levels (RWD/ROR compatible)
• Master/Slave timing compensation
• Dual 32-bit VMEbus interface boards, Double-Width EuroCard form factor
• Four industry-standard 50-pin flat cable interconnect (6-foot standard, 20-foot maximum)
– Typical Applications
• Multi-card-cage VMEbus system expansion
• Star or Daisy-Chain configuration deployment
• Extended VMEbus network topologies requiring timing compensation
– Compatibility & Integration
The PT-VME 910N integrates into existing VMEbus infrastructures supporting Revision C specifications. It accommodates both Star and Daisy-Chain multi-cage configurations and maintains full Master/Slave timing compensation across extended interconnect distances.
