本例源代码文件由用户按照书中的操作步骤自己生成，“Example-2-1\Project_Navigator_Demo\源代码”目录下为源代码的参考文件。“Example-2-1\Project_Navigator_Demo\counter”目录下为完整的工程，包括源代码文件、综合与实现的结果文件、ISE工程文件等，可以使用ISE工程管理器打开工程，供读者参考-In this case the source code files by the user in accordance with the steps the book itself is generated, "Example-2-1 \ Project_Navigator_Demo \ source" directory as the source code reference document. "Example-2-1 \ Project_Navigator_Demo \ counter" directory for a complete project, including source code files, integrated with the realization of the outcome document, ISE project file, etc. You can use ISE Project Manager, open the project for the reader is referred to