Home Methodologies OVM Tutorial OVM sequencer
Main Menu
System Verilog
    - OVM Tutorial
        -- OVM Overview
        -- CRV in OVM
        -- OVM Based Env
        -- UVC in OVM
        -- Data Item
        -- Sequence Item Macros
        -- ovm-driver
        -- OVM sequencer
        -- OVM Monitor
        -- OVM Sequences
        -- OVM build in sequences
        -- OVM Do macros
        -- OVM Test
        -- Messaging utilities
    - OVM Example
    - UVM
    - VMM
    - VMM RAL
    - VMM Example
    - AVM Tutorial
Open Vera
Digital Concepts
Verification Basics
Interview Questions
Computer Architechture
C and C++
AsicGuru Blog
Tags Cloud
Usefull Sites
Know Your IP/Location
Local Information India
Buy Car/Inverter Batteries
Real Estate India
Sports Accessories India
OVM sequencer and OVM sequencer utils
Share This Articale:

OVM sequencer :

Sequencer generates stimulus data and passes it to the driver. All sequencers should be derived from the ovm_sequence base class directly or indirectly. Sequencer have a TLM port which is connected to the driver. ovm_sequence base call is parameterized for request and respose item types.

So to create a sequencer to you need to :

  • Derive a sequencer from the ovm_sequencer base class and specify the request and response type parameters
  • Use `ovm_sequencer_utils and `ovm_update_sequence_lib_and_item to indicate the generated data item type and field desired automation

Connecting the Driver and Sequencer :

The driver and the sequencer are connected via TLM, with the driver’s seq_item_port connected
to the sequencer’s seq_item_export. elow). The sequencer produces data items to provide via the export. The driver consumes data items through its seq_item_port, and optionally provides responses. The component that contains the instances of the driver and sequencer makes the connection between them

Example :


OVM sequencer example :

// OVM sequencer example 
class mem_master_sequencer extends ovm_sequencer # (mem_transfer);

    protected virtual mem_if m_if;

    protected int master_id;

    `ovm_object_utils_begin (mem_master_sequencer)
        `ovm_field_int (master_id, OVM_ALL_ON)


    // constructor
    function new (string name = "mem_master_sequencer", ovm_component parent = null) ;
        super.new (name, parent);
    endfunction : new

    function void assign_vi (virtual interface mem_if m_if);
        this.m_if = m_if;
    endfunction : assign_vi

endclass : mem_master_sequencer

Keywords : ovm_sequencer   sequencer  

This Articles is written/submitted by puneet (Puneet Aggarwal). You can also contribute to Asicguru.com. Click here to start

Prev << ovm-driver

Next >> OVM Monitor

Posted By : Santosh - Feb. 2, 2010, 6:27 a.m.

Hi Puneet, I am looking for virtual sequencer example. --Santosh.

Sign In
Login with :-
| | |  
  • Bookmark