Intent:
To be able to select and execute one of several sequences at will.
Motivation:
Often it is convenient to generate data using one virtual or abstract representation that needs to go through a transformation process before it can be applied to a concrete interface. In other stimulus generation scenarios it may be necessary to map or combine several virtual data streams into a single data stream.
Applicability:
The layering sequence pattern is applicable to any situation where sequences are available that use one sequence_item but must transformed to another sequence_item to be executed on a target sequencer. An example of this would be converting a uvm_tlm_generic_payload item to a bus specific sequence_item.
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