When a net is used as source, then the first driver pin of net is the actual source used in. When dealing with muxed clocks, it is important to do set_case_analysis on all controlling points to force the muxes into a known state. In this part basically, we set clocks definition, clock group, clock latency, clock uncertainty, clock transition, input delay, output delay, timing derates etc.
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To compute the latency for the generated clock, the tool traces both sequential and combinational paths between the source pin of the generated clock and the. Creates clock on specified source object (usually clk ports, but may be pins or nets too. So if we were to define the gen_clock based on the edges of master clock, below how it will like.
Generated clocks are treated by the sta tool as synchronous to master/base clocks and automatically infers source latency = source latency of base clock + latency between the base.
When a clock is derived from a master clock it is referred to as a generated clock. For example, if the generated. We introduce the idea of consistent timing constraints and show how primetime can be used to create and manage timing constraint files needed for all other implementation tools, from. There are several reasons for this:
The master clock is a clock defined by using the create_clock command. Helps model the behavior of paths where there is no direct clock signal, such as asynchronous or combinational paths.
