Intel® Quartus® Prime Pro Edition User Guide: Timing Analyzer

ID 683243
Date 9/26/2022
Public

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3.5.1.12. Report Neighbor Paths

The Timing Analyzer's Reports > Design Metrics > Report Neighbor Paths... command helps you to determine the root cause of critical paths (for example, high logic level, retiming limitation, sub-optimal placement, I/O column crossing, hold fix-up, time borrowing, or others). The equivalent scripting command is report_design_metrics -neighbor_paths.
Figure 60. Report Neighbor Paths Report

Report Neighbor Paths reports the most timing-critical paths in the design, including associated slack, additional path summary information, and path bounding boxes. Report Neighbor Paths shows the most timing-critical Path Before and Path After each critical Path. You can optionally view multiple before and after paths. Retiming or logic balancing of the Path can simplify timing closure if there is negative slack on the Path, but positive slack on the Path Before or Path After.

Table 17.  Report Neighbor Path Dialog Box Settings
Option Description
Clocks From Clock and To Clock filter paths in the report to show only the launching or latching clocks you specify.
Targets Specifies the target node for From Clock and To Clock to report neighbor paths with only those endpoints. Specify an I/O or register name or I/O port for this option. The field also supports wildcard characters. When the From, To, or Through boxes are empty, the Timing Analyzer assumes all possible targets in the device. The Through option limits the report for paths that pass through combinatorial logic, or a particular pin on a cell.
Analysis type The Analysis type options are Setup, Hold, Recovery, or Removal. The Timing Analyzer reports the results for the type of analysis you select.
Paths Specifies the number of paths to display by endpoint and slack level. The default value for Report number of paths is 10, otherwise, the report can be very long. Enable Pairs only to list only one path for each pair of source and destination. Limit further with Maximum number of paths per endpoints. You can also filter paths by entering a value in the Maximum slack limit field.
Report Number of Neighbor Paths Specifies the number of neighbor paths to report, allowing you to view a number of the top adjacent paths entering the critical path, and the top paths exiting the critical path.
Report panel name Specifies the name of the report panel. You can optionally enable File name to write the information to a file. If you append .htm or .html as a suffix, the Timing Analyzer produces the report as HTML. If you enable File name, you can Overwrite or Append the file with latest data.
Tcl command Displays the Tcl syntax that corresponds with the GUI options you select. You can copy the command from the Console into a Tcl file.
Extra Info Specifies extra info.

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