What is meant by "Virtual clock" or a "Virtual clock definition"?

[anishjp]

Hi all:idea:,

What is meant by "Virtual clock" or a "Virtual clock definition".

 

[lakshman.ar]

Virtual Clock

virtual clock as the name suggests doesnt exist physically in the design at all, its jus used for the specifying the input / output delay values ( if no clock is existing )

virtual clock can be created same as Create_clock, excpet tht the port/pin name must not be specified !

incase if u have a purely combinational path and if u want to specify a set_input_delay or a set_output_delay for that path, then the virtual clock is used ( this is the one use that i kno ... en1 can come up with more ??? )