derive_clocks (::quartus::sdc)
The following table displays information for the derive_clocks Tcl command:
Tcl Package and Version |
Belongs to ::quartus::sdc 1.5 |
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Syntax | derive_clocks [-h | -help] [-long_help] -period <period_value> [-waveform <edge_list> ] | |||
Arguments | -h | -help | Short help | ||
-long_help | Long help with examples and possible return values | |||
-period <period_value> | Speed of the default clock in terms of clock period | |||
-waveform <edge_list> | List of edge values | |||
Description |
Creates a clock on sources of clock pins in the design that do not already have at least one clock sourcing the clock pin. This command is equivalent to calling create_clock on each clock source in the design that does not already have a clock assigned to it. See the help for create_clock for more information. Intel does not recommend using this command during final sign-off analysis of a design. derive_clocks should only be used early in the design phase when the clocks are not completely known. When possible, create_clock and create_generated_clock should be used instead. |
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Example Usage |
# Automatically create a 10ns, 60% duty cycle clock on all # unconstrained clock sources derive_clocks -period 10 -waveform {0 6} |
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Return Value | Code Name | Code | String Return | |
TCL_OK | 0 | INFO: Operation successful |