Table of Contents
Why is connect phase bottom up?
Rest other phases are bottom up phases,take the example of connect phase,it is basically used for TLM interconnection between the components and generally its needed to move up the hierarchy as the connections are mostly port to port,port to export and export to export.
Which phase in UVM are top down?
build phase
All UVM phases are bottom-up except the build phase which is top down (because the parent components have to be constructed already when the child components are built).
Is run phase bottom up?
the run phase is implemented as a task and remaining all are function….Phases Description:
| Phase | Description | Execution Order |
|---|---|---|
| start_of_simulation | used for printing testbench topology or configuration information | bottom-up |
Why phases are used in UVM?
The reason why UVM came up with such phases is because synchronization among all design-testbench was necessary. Using Verilog and VHDL, verification engineers did not have facilities such as clocking block or run phases. That is the main reason why UVM has different phases.
What is build phase in UVM?
1) Build Phase: The build phases are executed at the start of the UVM Testbench simulation and their overall purpose is to construct, configure and connect the Testbench component hierarchy. All the build phase methods are functions and therefore execute in zero simulation time.
Why do we use phases in UVM?
How many phases are there in UVM?
We’ll see more details of these 3 Phases in the upcoming section of this post. We know that UVM environment is built of static components those are derived from the UVM base class i.e. uvm_component which contains number of virtual methods. These virtual methods supports the UVM Phasing mechanism.
What are phases in UVM?
UVM Common Phases
| UVM Common Phases | The common phases are the set of function and task phases that all uvm_components execute together. |
|---|---|
| uvm_check_phase | Check for any unexpected conditions in the verification environment. |
| uvm_report_phase | Report results of the test. |
| uvm_final_phase | Tie up loose ends. |
What is main phase in UVM?
main phase is where the stimulus specified by the Test case is generated and applied to the DUT. It completes in two conditions: One is the stimulus gets exhausted and another is when timeout occurs. Sequences are started in this phase to generate the stimulus.
What is phase jumping in UVM?
Posted August 2, 2018. When jumping form run phase to extract phase, the UVM BCL somehow invokes the extract phase twice. But when jumping from run phase to final phase, the final phase is invoked once only.
Why build phase is top-down in UVM?
Typically, build phase contains UVM factory create methods which creates UVM component in testbench. For e.g. Test creates Env, Env creates Agent. In-order to create Driver component, Agent needs to be created first, and Env before that. This is the reason build phase function is top-down.
Which callbacks are implemented in UVM_component?
Any class deriving from uvm_component may implement any or all of these callbacks, which are executed in a particular order the run phase is implemented as a task and remaining all are function. 1. Build Phases build phase, connect phase and end_of_elobaration phase belongs to this category.
Why is the CONNECT method bottom up in UVM?
But the reason for being bottom up approach may be because of port export connection in the graph which extends from lower level to high level components and after which connect method can be called which extends from uvm_port_base#IF.IF is the interface for the API being used.
What are the different phases of UVM testbench simulation?
1. Build Phases build phase, connect phase and end_of_elobaration phase belongs to this category. Phases in this categorize are executed at the start of the UVM testbench simulation, where the testbench components are constructed, configured and testbench components are connected.