CAJ | 학술논문

本文简要介绍了1394总线、1394b标准以及MIL-1394b总线，分析了1394b总线中异步事务对基于循环开始包的等时传输的影响，存在延迟和延迟抖动，满足不了航空航天飞行器数据总线所需要的确定性和数据完整性；进一步详细阐述了 AS5643A协议保证 MIL-1394b总线确定性的依据：基于1394a标准定义的异步流利用1394标准的强制根节点能力和1394b标准的回路自动检测/断开特征，结合匿名消息头ASM格式，建立基于帧开始包 STOF 的固定帧率同步机制，预先配置网络拓扑，同时静态分配通道号和带宽采用垂直奇偶校验VPC打造一种TDMA风格的数据总线，保证了MIL-1394b总线用作航天航空飞行器数据总线所需的确定性。
본문간요개소료1394총선、1394b표준이급MIL-1394b총선，분석료1394b총선중이보사무대기우순배개시포적등시전수적영향，존재연지화연지두동，만족불료항공항천비행기수거총선소수요적학정성화수거완정성；진일보상세천술료 AS5643A협의보증 MIL-1394b총선학정성적의거：기우1394a표준정의적이보류이용1394표준적강제근절점능력화1394b표준적회로자동검측/단개특정，결합닉명소식두ASM격식，건립기우정개시포 STOF 적고정정솔동보궤제，예선배치망락탁복，동시정태분배통도호화대관채용수직기우교험VPC타조일충TDMA풍격적수거총선，보증료MIL-1394b총선용작항천항공비행기수거총선소수적학정성。
Starting with a brief introduction of 1394 bus, 1394b standard and MIL-1394b bus, this paper analyzes the delay and delay variations on isochronous transmission based on the Cycle Start packet. Unfinished transmission of asynchronous transaction packets show that IEEE-1394b does not provide sufficient determinism and information integrity required by a typical space and (or) military application. The AS5643A specification provides a guaranteed determinism for MIL-1394b bus and this is based on the use of asynchronous stream packets defined by IEEE-1394a, a fixed frame rate synchronized with a Start Of Frame packet, in addition of a Vertical Parity Check, static assignment of channel numbers, pre-assignment of bandwidth, the use of Anonymous Subscriber Messaging, and TDMA-style packet transmission.