Keywords
Citation
(1998), "VME/VXI interface boards allow system development on four Mil-Std-1553 data buses", Aircraft Engineering and Aerospace Technology, Vol. 70 No. 6. https://doi.org/10.1108/aeat.1998.12770fad.010
Publisher
:Emerald Group Publishing Limited
Copyright © 1998, MCB UP Limited
VME/VXI interface boards allow system development on four Mil-Std-1553 data buses
VME/VXI interface boards allow system development on four Mil-Std-1553 data buses
Keywords Data bus, DDC, Printed circuit boards
Data Device Corporation has introduced two intelligent, fully-featured VME/VXI interface boards, each of which can operate with up to four independent Mil-Std-1553A/B, dual redundant data buses. The BU-65528, and its ruggedised counterpart, BU-65527, offer an interface between multiple dual-redundant Mil-Std-1553A/B serial data buses and parallel VME and VXI buses.
MIL-STD-1553 is the standard military aircraft two-wire data bus used throughout the Western world. The BU-65528 and BU-65527 will now allow four channel test and simulation systems, as well as real-time 1553 communications, to be built using VME and VXI environments.
Software controls the operation of each independent channel of the BU-65528/27 as either a Mil-Std-1553 bus controller (BC), remote terminal (RT) or bus monitor (BC).
The BU-65528/27 implements each dual redundant 1553 interface using DDC's BU-61586 Advanced Communications Engine (ACE) components. The board may be configured with one, two, three or four of the ACE components, making it possible to interface with up to four independent dual redundant Mil-Std-1553 buses.
Each 1553 channel contains 12K × 16 of memory mapped on-board shared RAM which is double buffered to prevent partially updated data from being read by the VME/VXI host. Each mode of operation (BC, RT or MT) implements sophisticated data buffering structures which reduce the real time software requirements and off-load the host processor.
The BC mode's frame auto-repeat option and programmable message-gap timing greatly simplify the mechanism for controlling the repetitive timing of 1,553 messages. Other BC mode features includes automatic retries and BC interrupts, flexible support of 1553A devices, and programmable response time-out.
The RT architecture offers true multiprotocol functionality with programmable options for support of Mil-Std-1553A, The various McAir protocols and Mil-Std-1553B Notice 2. Other key features include a set of interrupt conditions, internal command illegalisation, and programmable busy-by-subaddress.
The MT architecture provides a Word Monitor mode which monitors both 1553 buses, and a Selective Message Monitor mode which provides monitor filtering based on RT address, greatly reducing the software and processing burden of the host CPU. The boards also offer a simultaneous RT/Monitor mode providing complete RT operation for the board's strapped RT address, and a bus monitor capability for the 30 other non-broadcast RT addresses.
The boards measure 23.3 × 17.0cm. The ruggedised BU-65527 is conduction cooled as per IEEE1101.2, and meets the stringent environmental specifications required by military applications.
More information can be obtained from Data Device Corporation (DDC). Tel: +44 (0) 1635 40158; Fax: +44 (0) 1635 32264.