get_active_clocks (::quartus::sdc_ext)
The following table displays information for the get_active_clocks Tcl command:
| Tcl Package and Version | Belongs to ::quartus::sdc_ext 1.0 |
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| Syntax | get_active_clocks [-h | -help] [-long_help] | ||
| Arguments | -h | -help | Short help | |
| -long_help | Long help with examples and possible return values | ||
| Description |
Returns the collection of active clocks for timing analysis. The active clocks are the the clocks specified in the most recent call to set_active_clocks, or all clocks if set_active_clocks has not been called. Avoid using the get_active_clocks command if your design targets a HardCopy series device or if you plan to migrate your design to a HardCopy series device. |
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| Example Usage |
# Set some active clocks
set_active_clocks [get_clocks {clk1 clk2 sysclk*}]
# Update the active clocks to exclude clk1
set_active_clocks [remove_from_collection [get_active_clocks] [get_clocks clk1]]
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| 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. | |