Intel® Quartus® Prime Pro Edition User Guide: Scripting

ID 683432
Date 10/04/2021
Public

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3.1.27.15. remove_clock_uncertainty (::quartus::sdc)

The following table displays information for the remove_clock_uncertainty Tcl command:

Tcl Package and Version

Belongs to ::quartus::sdc

Syntax remove_clock_uncertainty [-h | -help] [-long_help] -from <from_clock> -to <to_clock>
Arguments -h | -help Short help
-long_help Long help with examples and possible return values
-from <from_clock> Valid destinations (string patterns are matched using Tcl string matching)
-to <to_clock> Valid destinations (string patterns are matched using Tcl string matching)
Description

Removes clock uncertainty from a collection of clocks to a collection of clocks. The source and destination clocks can be any arbitrary collection of clocks. This command removes all uncertainty between two clocks. If there does not exist uncertainty between two clocks specified in remove_clock_uncertainty, the command does nothing for those two clocks but continues to attempt to remove uncertainty between other clocks specified. The values of the -from and -to options are either collections or a Tcl list of wildcards used to create collections of appropriate types. The values used must follow standard Tcl or Timing Analyzer-extension substitution rules. See the help for use_timing_analyzer_style_escaping for details.

Example Usage
set_clock_uncertainty -setup -rise_from {clk1 clk2} -fall_to {clk3 clk4} 200ps
set_clock_uncertainty -from {clk5 clk6} -to {clk7 clk8} 300ps
remove_clock_uncertainty -from {clk3 clk5} -to {clk4 clk7}
Return Value Code Name Code String Return
TCL_OK 0 INFO: Operation successful

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