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In this blog, we will see how to do synchronization using uvm_objection.

UVM provides "raise_objection" method for raising objections and "drop_objection" method for dropping objections in the testbench. These methods are the part of "uvm_objection" class. We will see, how these methods synchronizes various tasks in the component.

Below is an example of a normal code where an objection is raised and then the two tasks (response and process_txn) are executed in parallel. One can assume that, after getting transaction from "seq_item_port", the driver is executing that transaction and receiving response for the same. In "process_txn" task, two tasks are called in a serial way, "process_header" followed by "process_data". Once execution of "process_header" task is completed, "process_resp" event is triggered which executes "response" task (from waiting state of the same event). In parallel with that, "process_data" task is executed. Once "response" and "process_txn" tasks are completed, an objection is dropped.

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