目录
1 引言..................................................................................................................................................2
1.1 目的.......................................................................................................................................2
1.2 背景.......................................................................................................................................2
1.3 参考资料...............................................................................................................................2
2 任务概述..........................................................................................................................................3
2.1 产品描述...............................................................................................................................3
2.1.1 系统功能概述............................................................................................................3
2.1.2 功能方框图................................................................................................................4
2.2 假定和约束...........................................................................................................................4
3 数字流图与数字词典......................................................................................................................5
3.1 数据流图...............................................................................................................................5
3．2 数据字典............................................................................................................................6
3.2.1 数据流........................................................................................................................6
3.2.2 数据流分量................................................................................................................7
3.2.3 数据存储....................................................................................................................8
4 接口..................................................................................................................................................9
5．性能需求.....................................................................................................................................10
5.1 精度.....................................................................................................................................10
5. 3 灵活性................................................................................................................................11
5. 4 系统可扩展性....................................................................................................................11
5. 5 系统安全性........................................................................................................................11
5.6 系统易使用性.....................................................................................................................11
5.7 故障处理要求.....................................................................................................................11
6 其它专门要求................................................................................................................................12
6．1 数据库..............................................................................................................................12
6.2 系统 IPO 图.........................................................................................................................12
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