The U.S. Navy Next Generation Computer Resources (NGCR) High Speed Data Transfer Network (HSDTN) program has chosen the IEEE Scalable Coherent Interface (SCI) as one of its baseline standards. This paper proposes to use SCI as a unified avionics network and describes SCI and extensions to it -- particularly an extension known as SCI/ Real Time (SCI/RT). Because SCI can be used in a serial configuration, such a network provides an alternative to the need for ever denser and ever more reliable backplane connectors by reducing the number and size of interconnects and, hence, the need for large numbers of pins. In addition, SCI reduces packaging problems by using a small amount of board real estate and by using distance insensitive links which can extend board to board or box to box, thus facilitating a distributed backplane approach for retrofit aircraft applications. SCI is currently being applied to both parallel and to serial implementations, to both message passing and shared memory computing paradigms, and to both electrical and optical physical layers. SCI/RT is a set of proposed enhancements, developed initially by the Canadian Navy and now being evaluated by the NGGR HSDTN and IEEE working groups, to make SCI more fault tolerant and to provide the determinism and priorities necessary to support Rate Monotonic Scheduling. Addition of these features will allow SCI to perform in a unified and seamless manner, the functions of command and control interconnect, data flow network and sensor/video network. Electrical and optical, and serial and parallel links can be intermixed for the most cost effective solution. As an added benefit, SCI has potential for use interconnecting multiple processing chips on the same board.


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    Title :

    IEEE Scalable Coherent Interface: An Approach for a Unified Avionics Network


    Contributors:
    R. Lachenmaier (author) / T. Stretch (author)

    Publication date :

    1994


    Size :

    10 pages


    Type of media :

    Report


    Type of material :

    No indication


    Language :

    English




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