You must update the project settings to select the new top-level entity, CortexM1_ExampleDesign_Top. Add the top-level file to the project by selecting Project → Add/Remove files in Project... from the menu to bring up the Files pane of the Quartus II project Settings window as shown in Figure 8.28.

Figure 8.28. Quartus II Project File settings dialog

Select the top-level file, CortexM1_ExampleDesign_Top.v by pressing the ... button next to the File name field and browsing for the file. After opening the file in the file selection dialog, click the Add button in the Files pane of the settings window to add the file to the project.

You must also select CortexM1_ExampleDesign_Top as the top-level design entity. Select General from the Category list in the project Settings window. In the General pane which now appears, replace the contents of the Top-level entity field with CortexM1_ExampleDesign_Top and press OK.