module ovmb session5 connecting components

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academy@mentor.com 

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Basic OVMConnecting Components 

John Aynsley CTO, Doulos 

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Verification Components

Agent

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OVM Class Hierarchy

ovm_env ovm_agent ovm_driver

ovm_monitor

ovm_scoreboard

ovm_test ovm_sequencer

Structureovm_component

ovm_object

ovm_report_object

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Component

class my_agent extends ovm_agent;

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Component

class my_agent extends ovm_agent;

`ovm_component_utils(my_agent)

my_sequencer my_sequencer_h;

my_driver my_driver_h;

function new(string name, ovm_component parent);

super.new(name, parent);

endfunction: new

function void build;

...

function void connect;

...

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Factory Method

function void build;

super.build();

my_sequencer_h =

my_sequencer::type_id::create("my_sequencer_h", this);

my_driver_h =

my_driver ::type_id::create("my_driver_h" , this);

endfunction: build

"Factory methods" can be overridden in tests

Instance name Parent

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Connect

function void build;

super.build();

my_sequencer_h =

my_sequencer::type_id::create("my_sequencer_h", this);

my_driver_h =

my_driver ::type_id::create("my_driver_h" , this);

endfunction: build

function void connect;

my_driver_h.seq_item_port.connect(

my_sequencer_h.seq_item_export );

endfunction: connect

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Connect

function void build;

super.build();

my_sequencer_h =

my_sequencer::type_id::create("my_sequencer_h", this);

my_driver_h =

my_driver ::type_id::create("my_driver_h" , this);

endfunction: build

function void connect;

my_driver_h.seq_item_port.connect(

my_sequencer_h.seq_item_export );

endfunction: connect

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Phase Methods

class my_component extends ovm_component;...

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Phase Methods

class my_component extends ovm_component;...

function new(string name, ovm_component parent);

super.new(name, parent);

endfunction: new

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Phase Methods

class my_component extends ovm_component;...

function new(string name, ovm_component parent);

super.new(name, parent);

endfunction: new

function void build;

super.build();...

Called top-down

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Phase Methods

class my_component extends ovm_component;...

function new(string name, ovm_component parent);

super.new(name, parent);

endfunction: new

function void build;

super.build();...

function void connect;

...

Called bottom-up

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Phase Methods

class my_component extends ovm_component;...

function new(string name, ovm_component parent);

super.new(name, parent);

endfunction: new

function void build;

super.build();...

function void connect;

...

function void start_of_simulation;

...

task run;...

The only task

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Anatomy of an OVM Component

class my_component extends ovm_component;`ovm_component_utils(my_component)

virtual dut_if dut_if_h;

my_sequencer my_sequencer_h;

my_driver my_driver_h;

function new(string name, ovm_component parent); ...

function void build; ...

function void connect; ...

function void start_of_simulation; ...

task run; ...function check; ...

function report; ...

endclass

Factory registration

External interfaces

Internal component handles

Standard phase methods

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Summary

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academy@mentor.com 

www.verificationacademy.com 

Basic OVMConnecting Components 

John Aynsley CTO, Doulos