GSO ISO/IEC 11458:2015
Gulf Standard
Current Edition
·
Approved on
03 September 2015
·
Information technology -- Microprocessor systems -- VICbus -- Inter-crate cable bus
GSO ISO/IEC 11458:2015 Files
English
92 Pages
Current Edition
Reference Language
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GSO ISO/IEC 11458:2015 Scope
The widespread use of high-performance, multi-processor systems based on backplane buses such as the IEC 821 bus (VMEbus), has inevitably led to the requirement to create multi-crate (-subrack, -chassis, etc.) systems. The VICbus inter-crate cable bus is designed to achieve such assemblies in a standard way.
VICbus, a multiplexed, multi-master, multi-slave cable bus, connects multiple backplane buses or stand-alone devices, providing transparent, softwareless interconnection for low latency short data transactions and fast transmission of data blocks over cables of up to 100 m in length. Address and data signals, each of 32 bits, together with those necessary for the control of the bus protocols, signal multiplexing, reset and error reporting are transmitted on twisted-wire pairs using differential line drivers and receivers. Up to 31 devices are permitted on a single VICbus cable.
VICbus data transfer protocols include both a compelled mode with end-to-end acknowledgement as well as two, high speed, non-compelled modes for high rate data transfers. The compelled protocols allow both broadcast (master write) and broadcall (master read) data transfers. One of the noncompelled protocols allows broadcast transfers, whereas neither permit broadcall operation.
Inter-master arbitration uses an efficient, modified single-level, daisy-chained mechanism. The interrupt mechanism allows 32 interrupt requests, multiplexed on eight physical lines. The specification includes system failure reporting, reset and live connection and disconnection, as well as the specification of control and status registers. Particular attention has been paid to redundancy of operation.
Whilst VICbus has been derived with multi-crate backplane bus systems in mind, this specification does not preclude the design of stand-alone VICbus devices. A normative annex giving rules and recommendations for a VMEbus to VICbus interface has been included, and further, similar annexes for other backplane bus standards will be added as the need arises.
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