Curtiss-Wright / VMETRO VBT-321B VME Analyzer Module

The Curtiss-Wright/VMETRO VBT-321B is a single-slot VME analyzer module that captures, monitors, and analyzes data traffic on VMEbus systems in real time. It detects errors, measures performance, and aids in debugging and optimizing VME-based embedded systems through comprehensive bus analysis and protocol validation.

## Technical Specifications

**Form Factor:** Single-slot VME module

**Trace Buffer:** 2M Sample Trace Buffer @ 256-bits

**Slave Memory:** 8 MB, locatable anywhere in VME address map; supports single cycles or block transfers up to 320 MB/s

**Counters:** 3 × 32-bit Occurrence/Delay Counters

**Sequencer:** 16 levels with If, Else, Elsif, Goto, Count, Delay, Trigger, Store, and Halt capabilities

**Interfaces:** Host and Terminal connectors (Female DB-25 each), External Input (BNC), Trigger Output (BNC), 10/100 Mbit/s Ethernet, USB for PC control

**Front Panel:** Manual Reset Switch

## Key Features

• Captures and analyzes VME, VME64, 2eVME, and 2eSST bus traffic including arbitration, interrupts, block cycles, and RMW operations

• Multi-level Trace Viewer enables different data visualization perspectives

• Optional protocol checker (-VP option) detects up to 60 VME errors automatically with background operation capability

• Edge triggering and Address/Data range triggering: 8 A64 address ranges, 8 D64 data ranges

• LVTTL level trigger output with programmable polarity, level, or pulse; may pulse on each stored sample

• Supports normal and block cycles on any BR level with selectable RWD, ROR, ROC, or RNE release options

• Compatible with piggyback modules such as VBAT-PB (VME Bus Anomaly Trigger) for enhanced protocol violation analysis

## Typical Applications

Debugging and performance optimization of VME-based embedded systems; real-time bus monitoring; protocol validation and error detection in complex VME architectures.

## Compatibility & Integration

Controlled via Windows PC with Graphical User Interface such as Curtiss-Wright’s BusView™. Operates across all standard VME bus variants. Supports master and slave operations with flexible address mapping and high-speed block transfer capability.