How to define clock generated by the other clock?

David,

I am not sure if anybody gave you the actual answer to your specific question. The answer is very simple:

CLKA and CLKB are in fact related, and should not be cut unless you have a specific reason to do so (like a FIFO to synch up the transfer). The delay between CLKA and CLKB is modeled as clock latency (both by TimeQuest and Classic). So, all you need to do is:

create_clock -period 10 CLKA

create_generated_clock -divide 2 -source CLKA CLKB

TimeQuest will then do everything right. If you want to then see the details of the analysis, remember to use "-detail full_path" when running report_timing. That will show you the delays between CLKA and CLKB.

You can see the example at:

http://www.altera.com/support/examples/timequest/exm-tq-generated-clock.html