why we use generated_clock??????

[jhjgdk]

when create a clock ....we use create_clock command...

so, we can make clocks

we can use

creaate_clock -name CLKA -period 10

creaate_clock -name CLKA -period 20


but I dont know why we use generated_clock ...

I think it related to synchronous and asynchronous clock domain..

also, i can't understand that different between synchronous and asynchronous.. i think it just use another clock domain..

I`m confuse.. help me....

 

[rca]

generated_clock will indicate there is a relation between the source clock and the generated clock, could be considered as synchronous by this way, perhap with a phase.

 

[beowulf]

If a source delay is specified for the parent clock, it need not be given again for the generated clock. Same for uncertainity. Not sure about the clock_transition parameters.
Also both clocks are related, else we will need to specify false_path between them.

 

[jeevan.life]

Generated clocks are derived from source clocks by using clock divider circuits. These are needed when you have a certain part of the circuit working at lower frequency without having to add a PLL to create a new clock.