derive_clocks
derive_clocks
The following table displays information for the derive_clocks Tcl command:
Tcl Package and Version |
Belongs to ::quartus::sdc 1.5 |
||||||||
Syntax |
derive_clocks [-h | -help] [-long_help] -period <period_value> [-waveform <edge_list>] |
||||||||
Arguments |
|
||||||||
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. Altera 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. |
||||||||
Example Usage |
# Automatically create a 10ns, 60% duty cycle clock on all # unconstrained clock sources derive_clocks -period 10 -waveform {0 6} |
||||||||
Return Value |
|
作者:星雨夜澈
出处:http://www.cnblogs.com/dxs959229640/
声明:欢迎转载,但未经作者同意必须保留此段声明,且在文章页面明显位置给出原文链接。