Intel® Quartus® Prime Pro Edition User Guide: Scripting

ID 683432
Date 10/04/2021
Public

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3.1.29.47. report_clock_network (::quartus::sta)

The following table displays information for the report_clock_network Tcl command:

Tcl Package and Version

Belongs to ::quartus::sta

Syntax report_clock_network [-h | -help] [-long_help] [-append] [-file <name> ] [-include_non_clock_paths] [-initial_depth <number> ] [-panel_name <name> ] [-show_full_paths] [-stdout] [-target <names> ]
Arguments -h | -help Short help
-long_help Long help with examples and possible return values
-append If output is sent to a file, this option appends the result to that file. Otherwise, the file will be overwritten. This option is not supported for HTML files.
-file <name> Sends the results to an ASCII or HTML file. Depending on the extension
-include_non_clock_paths Show paths that are potentially in the clock network. These paths terminate at a register's clock pin but do not start at a clock source.
-initial_depth <number> Initial clock network depth to report.
-panel_name <name> Sends the results to the panel and specifies the name of the new panel
-show_full_paths Show the full clock paths - do not reduce the table size by condensing multiple trivial nodes into one row.
-stdout Send output to stdout, via messages. You only need to use this option if you have selected another output format, such as a file, and would also like to receive messages.
-target <names> Valid nodes in the clock network or clocks (string patterns are matched using Tcl string matching).
Description

The clock network report shows the netlist topology of clock paths that make up the clock network in a design. It allows the user to track a clock signal from its source, through transformations such as PLL's, to the loads that the clock drives. It also reveals clock relationships by indicating nodes where generated clocks are defined. The report can be directed to the Tcl console ("-stdout", default), a file ("-file"), the Timing Analyzer graphical user interface ("-panel_name"), or any combination of the three. Use the "-target" option to specify report targets. These can be clocks in the design or nodes on the clock network, for example PLL outputs. If you specify clocks as targets, the clock network report will use the clock's target nodes as report targets. The clock network report then displays all nodes in the clock network that are in the fanin and fanout cones of the report targets. If no report target is specified, all clock target nodes in the design are used by default. Each row in the report may include one node or multiple trivial nodes with singular fanin and fanout edge. To disable the behaviour of collapsing down trivial nodes into one row, use the "-show_full_paths" option. When running the clock network report in the Timing Analyzer GUI, rows in the main table corresponding to report target nodes are highlighted in light blue. You may click on each row of the table to view information such as clock frequencies, relationships, and why this node belongs in the clock network. You may right-click on any row to locate the node in other Quartus tools such as RTL Viewer. Use the "-initial_depth" option to reduce the height of the report table in the Timing Analyzer GUI. Rows in the main table that are deeper than the set initial depth will be collapsed by default, but can be manually expanded. If this option is not set, the report determines an appropriate initial depth to use. Use the "-include_non_clock_paths" option if a node that you expect to be in the clock network cannot be found. This option shows nodes that lead into a register's clock pin, but are not downstream of any known clock source. Furthermore, registers that are not clocked by any clocks will be shown using this option.

Example Usage
# Report the clock network that feeds into register regA
report_clock_network -panel {Report} -target [get_registers regA]

# Report the clock network starting from clk_100 clock, but show only the first 10 levels
report_clock_network -panel {Report} -target [get_clocks clk_100] -initial_depth 10

# Report the clock network passing through the combinational node clk_mux|combout.
# In the report, include paths that end at a register's clock pin but do not start 
# at a clock source.
report_clock_network -panel {Report} -target [get_nodes clk_mux|combout] -include_non_clock_paths
Return Value Code Name Code String Return
TCL_OK 0 INFO: Operation successful

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