get_clock_domain_info (::quartus::sta)

The following table displays information for the get_clock_domain_info Tcl command:

Tcl Package and Version

Belongs to ::quartus::sta 1.0

Syntax get_clock_domain_info [-h | -help] [-long_help] [-edge_slack] [-hold] [-mpw] [-recovery] [-removal] [-setup]
Arguments -h | -help Short help
-long_help Long help with examples and possible return values
-edge_slack Compute edge TNS (this option may significantly increase memory consumption)
-hold Hold Analysis
-mpw Minimum Pulse Width Analysis
-recovery Recovery Analysis
-removal Removal Analysis
-setup Setup Analysis (Default)
Similar to create_timing_summary, the
get_clock_domain_info command returns a Tcl list of
information about each active clock domain.  Each entry in
the list is a list of three elements: the clock name,
worst-case slack, and endpoint TNS.

If the edge_slack option is specified, a 4th entry in the
list will also be present, and will indicate the edge TNS.
Computing the edge TNS may result in a significant increase
in memory consumption.

TNS is total negative slack, and it is the sum of
all slacks less than zero for either destination
registers or ports in the clock domain (endpoint TNS)
or for all edges affecting the clock domain (edge

By default, this command creates a Setup Summary. This
command can also generate a Hold Summary (-hold),
Recovery Summary (-recovery), Removal Summary
(-removal), or Minimum Pulse Width Summary (-mpw).
Example Usage
project_open my_project

# Always create the netlist first
read_sdc my_project.sdc

# Get domain summary object
set domain_list [get_clock_domain_info -setup]
foreach domain $domain_list {
	set name [lindex $domain 0]
	set slack [lindex $domain 1]
	set keeper_tns [lindex $domain 2]

	puts "Clock $name : Slack = $slack , TNS = $keeper_tns"

# The following command is optional

Return Value Code Name Code String Return
TCL_OK 0 INFO: Operation successful
TCL_ERROR 1 ERROR: Timing netlist does not exist. Use create_timing_netlist to create a timing netlist.