GE VMIVME7459 VMEbus Industrial CPU Module

Description

The GE VMIVME7459 anchors the digital I/O layer in VME hierarchies, a 6U double-height module that aggregates 64 TTL lines (configurable as inputs or outputs in groups of 8) through programmable registers and opto-isolated transceivers, interfacing via the VME P1/P2 backplane for A24/D16 slave access from host SBCs at up to 1 MB/s bursts. It populates in slots 1-21 of standard crates, drawing +5 V system power to drive logic, where direction registers set port modes and interrupt controllers flag changes on rising/falling edges, routing signals to P2 connectors with 2.5 kV isolation for noise immunity. In operation, it accepts write strobes to load output latches or read input buffers, applies positive-true logic for TTL levels (0-5 V), then generates VME interrupts if enabled, with built-in test modes looping outputs to inputs for self-diagnostics that illuminate front-panel LEDs if faults persist. Specific hardware supports BITE functions, like pattern generation for continuity checks, without host intervention.