Overview
ISO/IEC 15776:2001 - VME64bus - Specification defines the VME64bus interfacing system for tightly coupled hardware configurations. The standard formalizes how microprocessors, memory/storage and peripheral control devices interconnect via a common backplane so devices can communicate without disturbing each other’s internal activity. Objectives include broad design latitude for cost/performance optimization and a system where throughput is device-limited rather than interface-limited. (This publication is supplied on CD‑ROM.)
Key topics
The standard is comprehensive and organized into functional and physical sections; major technical topics include:
- Data transfer bus: definitions of data-transfer-bus lines, module roles (master, slave, bus timer, location monitor), timing rules, and typical transfer cycles.
- Bus arbitration: arbitration philosophy, arbiter and requester modules, daisy-chain and priority schemes, race-condition handling and flow/sequence diagrams.
- Priority interrupt bus: interrupt subsystem structure, IACK daisy‑chain behavior, interrupter/handler roles, selection and acknowledge timing.
- Utility bus: system initialization/diagnostics, power and ground pins, auto slot ID and auto system controller functions.
- Electrical specifications: power distribution, signal characteristics, driver/receiver requirements, interconnections and termination practices.
- Mechanical specifications: VMEbus board and backplane form factors, front panels, assembly, conduction cooling, and connector/pin descriptions.
- Extensive timing diagrams, figures and normative annexes (glossary, connector/pin descriptions, board identification).
Keywords present in the standard: VME64bus, VMEbus, backplane, data transfer bus, bus arbitration, priority interrupt, utility bus, electrical specifications, mechanical specifications, connector pinout.
Applications and users
ISO/IEC 15776:2001 is intended for:
- Hardware designers creating VME64bus boards (masters, slaves, bus timers, location monitors).
- System integrators deploying VME backplanes in embedded systems, industrial control, telecommunications, defense and real‑time computing.
- Backplane and connector manufacturers ensuring mechanical and electrical compatibility.
- Test and validation engineers implementing timing, arbitration and interrupt conformance tests.
Practical applications include multi‑processor chassis, modular I/O and data-acquisition systems where deterministic, high‑reliability bus behavior and defined electrical/mechanical interfaces are required.
Related standards
ISO/IEC 15776 complements other VME family and backplane/connector specifications and normative annexes that define terminology and pinouts. Implementers should consider vendor application notes and existing VME ecosystem standards for interoperability and legacy compatibility.
