Tektronix / CDS 73A-851A VME/VXI to VXI Adapter Module

The Tektronix / CDS 73A-851A is a VME/VXI to VXI adapter module that bridges multiple bus architectures within VXIbus mainframes. This C-size VXI module enables installation of A or B size VME modules or A or B size VXIbus modules into a single C-size VXI card cage slot, providing signal buffering and routing to maintain VMEbus timing and integrity.

– Technical Specifications

• Form Factor: C-size VXI module, installable in any C- or D-size VXIbus mainframe slot except Slot 0
• Compatibility: Accepts A or B size VME modules or A or B size VXIbus modules
• Buffering: Buffers VME address bus, data bus, and control signals to preserve VMEbus environment and backplane line length
• Signal Routing: Routes buffered signals to installed module based on bus master or slave detection
• Power Rails (P2 Connector): +5 V, –5.2 V, –2 V, +24 V, –24 V
• Interrupt Levels: Selectable interrupt level configuration
• VXIbus Trigger Lines: Directional switches for ECLTRG0 and ECLTRG1 (configurable for input or output)
• VME Address Space: May reside in lower three quarters of A16 address space (0000h to 0BFFFh)

– Key Features

• Automatic bus master/slave detection and signal transceiving
• Configurable VXIbus ECL trigger line direction switches
• Integrated power and ground jumper blocks via P2 connector
• VXIbus Specification conformant design
• Support for Option 01 (B size VXI modules with P2 rows A and C access) or Option 02 (VME modules requiring P2 rows A and C access)

– Compatibility & Integration

The 73A-851A occupies a single mainframe slot. VME modules operating within this adapter benefit from full signal buffering, while VXIbus modules gain seamless P2 connector integration when options are selected. Caution: VXIbus power voltages applied to non-VXI-rated modules may cause equipment damage. Verify mainframe cooling capacity and power availability for the combined adapter and installed module load.