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UVM: Basic Sequences

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Arrow Devices
Arrow Devices

This document provides an overview of sequences in UVM. It discusses sequence items, sequencers, and how sequences are used to drive items to a driver. Sequences are derived from sequence items and contain a body method. They utilize a sequencer handle to send items to a driver. The document outlines how to create, configure, and start a sequence as well as the typical flow of a sequence item being sent from the sequencer to a driver.

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Any use of this material without specific permission of Arrow Devices is strictly prohibited May 2015 UVM:  Basic  Sequences         Chandra  Bhushan  Singh  
Topics  Covered   •  Sequence Item •  Sequencer •  Sequences 2 Arrow Devices Pvt Ltd
Sequence Item Arrow Devices Pvt Ltd
Sequence Item Content Sequence Item consists of the following Ø  Control : What type of transfer, what size Ø  Payload : The main data content of the transfer Ø  Configuration : Setting up a new mode of operation, error behavior etc Ø  Analysis : Convenience fields which aid analysis - time stamps, rolling checksums etc Arrow Devices Pvt Ltd
        Arrow Devices Pvt Ltd Randomiza7on  Considera7ons   Ø  Request properties should be rand Ø  Response properties should not be rand
Example:  Sequence  Item   Arrow Devices Pvt Ltd    
Arrow Devices Pvt Ltd Sequence  Item  Methods  
        Sequencer         Arrow Devices Pvt Ltd
Arrow Devices Pvt Ltd Sequencer  Characteris7cs   Sequencer has the following characteristics: Ø  Provides coordination between sequence and driver Ø  Sends transactions to driver Ø  Gets the response from the driver Ø  Responsible for arbitrating between the parallel sequences
Arrow Devices Pvt Ltd Sequencer-­‐Driver  Connec7on  
      Arrow Devices Pvt Ltd UVM  Sequencer  API   API’s Supported by UVM Sequencer Ø  get_next_item Ø  try_next_item Ø  item done Ø  peek Ø  get Ø  put
Arrow Devices Pvt Ltd Recommended  Driver-­‐Sequencer   API   Ø  get_next_item() followed by item_done() Ø  get(req) followed by put(rsp) 1 2
    Arrow Devices Pvt Ltd “get_next_item()”  followed  by   “item_done()”   1
Arrow Devices Pvt Ltd “get(req)”  followed  by  “put(rsp)”  2
Arrow Devices Pvt Ltd Sequences  
      Arrow Devices Pvt Ltd Sequences   Ø  Derived from an uvm_sequence_item Ø  Parameterized with the type of seq_item Ø  Body method Ø  m_sequencer handle Sequences have the following characteristics:
Arrow Devices Pvt Ltd Example:  Sequences  
Arrow Devices Pvt Ltd Running  a  Sequence   Ø  Step 1: Create Sequence Ø  Step 2: Configure Sequence Ø  Step 3: Start the Sequence
Arrow Devices Pvt Ltd  Step  1:  Create  Sequence  
Arrow Devices Pvt Ltd Step  2:  Configure  Sequence   Ø  Set up start values Ø  Set up generation loop variables Ø  Set up pointers to test-bench resources
Arrow Devices Pvt Ltd Step  3:  Start  Sequence     •  Call  to  its  start()  method  
Arrow Devices Pvt Ltd Sequence  Item  To  A  Driver:     The  Flow   Ø  Creation of seq item Ø  Ready - start_item() Ø  Set - Randomization Ø  Go - finish_item() Ø  Response - get_response()
Arrow Devices Pvt Ltd Sequence  Execu7on  Flow   Sequences have two types of execution Ø  Linear Execution Flow Ø  Parallel Execution Flow
Arrow Devices Pvt Ltd Coding  Guideline   Ø  Do not use fork, join_any, disable fork Ø  Do not use fork join_none to exit a body method Ø  Do not fork join a sequence which contains a forever loop without terminating condition
Arrow Devices Pvt Ltd Sequences  Overrides   Two types of overrides: Ø  Sequence Type Factory Override Ø  Sequence Instance Factory Override
Arrow Devices Pvt Ltd Sequence  Type  Factory  Override  
Arrow Devices Pvt Ltd Sequence  Instance  Factory   Override  
Thank  you   Arrow Devices Pvt Ltd

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UVM: Basic Sequences

  • 1. Any use of this material without specific permission of Arrow Devices is strictly prohibited May 2015 UVM:  Basic  Sequences         Chandra  Bhushan  Singh  
  • 2. Topics  Covered   •  Sequence Item •  Sequencer •  Sequences 2 Arrow Devices Pvt Ltd
  • 4. Sequence Item Content Sequence Item consists of the following Ø  Control : What type of transfer, what size Ø  Payload : The main data content of the transfer Ø  Configuration : Setting up a new mode of operation, error behavior etc Ø  Analysis : Convenience fields which aid analysis - time stamps, rolling checksums etc Arrow Devices Pvt Ltd
  • 5.         Arrow Devices Pvt Ltd Randomiza7on  Considera7ons   Ø  Request properties should be rand Ø  Response properties should not be rand
  • 6. Example:  Sequence  Item   Arrow Devices Pvt Ltd    
  • 7. Arrow Devices Pvt Ltd Sequence  Item  Methods  
  • 8.         Sequencer         Arrow Devices Pvt Ltd
  • 9. Arrow Devices Pvt Ltd Sequencer  Characteris7cs   Sequencer has the following characteristics: Ø  Provides coordination between sequence and driver Ø  Sends transactions to driver Ø  Gets the response from the driver Ø  Responsible for arbitrating between the parallel sequences
  • 10. Arrow Devices Pvt Ltd Sequencer-­‐Driver  Connec7on  
  • 11.       Arrow Devices Pvt Ltd UVM  Sequencer  API   API’s Supported by UVM Sequencer Ø  get_next_item Ø  try_next_item Ø  item done Ø  peek Ø  get Ø  put
  • 12. Arrow Devices Pvt Ltd Recommended  Driver-­‐Sequencer   API   Ø  get_next_item() followed by item_done() Ø  get(req) followed by put(rsp) 1 2
  • 13.     Arrow Devices Pvt Ltd “get_next_item()”  followed  by   “item_done()”   1
  • 14. Arrow Devices Pvt Ltd “get(req)”  followed  by  “put(rsp)”  2
  • 15. Arrow Devices Pvt Ltd Sequences  
  • 16.       Arrow Devices Pvt Ltd Sequences   Ø  Derived from an uvm_sequence_item Ø  Parameterized with the type of seq_item Ø  Body method Ø  m_sequencer handle Sequences have the following characteristics:
  • 17. Arrow Devices Pvt Ltd Example:  Sequences  
  • 18. Arrow Devices Pvt Ltd Running  a  Sequence   Ø  Step 1: Create Sequence Ø  Step 2: Configure Sequence Ø  Step 3: Start the Sequence
  • 19. Arrow Devices Pvt Ltd  Step  1:  Create  Sequence  
  • 20. Arrow Devices Pvt Ltd Step  2:  Configure  Sequence   Ø  Set up start values Ø  Set up generation loop variables Ø  Set up pointers to test-bench resources
  • 21. Arrow Devices Pvt Ltd Step  3:  Start  Sequence     •  Call  to  its  start()  method  
  • 22. Arrow Devices Pvt Ltd Sequence  Item  To  A  Driver:     The  Flow   Ø  Creation of seq item Ø  Ready - start_item() Ø  Set - Randomization Ø  Go - finish_item() Ø  Response - get_response()
  • 23. Arrow Devices Pvt Ltd Sequence  Execu7on  Flow   Sequences have two types of execution Ø  Linear Execution Flow Ø  Parallel Execution Flow
  • 24. Arrow Devices Pvt Ltd Coding  Guideline   Ø  Do not use fork, join_any, disable fork Ø  Do not use fork join_none to exit a body method Ø  Do not fork join a sequence which contains a forever loop without terminating condition
  • 25. Arrow Devices Pvt Ltd Sequences  Overrides   Two types of overrides: Ø  Sequence Type Factory Override Ø  Sequence Instance Factory Override
  • 26. Arrow Devices Pvt Ltd Sequence  Type  Factory  Override  
  • 27. Arrow Devices Pvt Ltd Sequence  Instance  Factory   Override  
  • 28. Thank  you   Arrow Devices Pvt Ltd