xilinx的时序约束实验，通过阅读本文档，你可以用全局时序约束来轻松提高已有的项目的系统时钟频率，同时你还可以用映射后静态时序报告以及布局布线后静态时序报告来分析你的设计性能-Xilinx timing constraints of the experiment, by reading this document, you can use the overall timing constraints to easily enhance existing projects the system