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UVM: Basic Sequences
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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Introductory slide indicating copyright information and presentation title on UVM basic sequences.
Covers main topics: Sequence Item, Sequencer, and Sequences.
Basic concept of Sequence Item introduced.
Details sequence item structure: control, payload, configuration, and analysis fields.
Emphasizes the need for randomized request properties while keeping response properties static.
Illustrates an example related to Sequence Item.
Discusses various methods associated with Sequence Items.
Introduction of the Sequencer concept.
Details Sequencer functions: coordination, transaction sending, response receiving, and arbitration.
Explains the connection between the Sequencer and Driver.
Overview of APIs supported by UVM Sequencer including get_next_item and others.
Guidance on using get_next_item() and get(req) followed by respective completing methods.
Detailed explanation for the usage of get_next_item() followed by item_done().
Detailed explanation for using get(req) followed by put(rsp).
Introduction to the concept of Sequences.
Sequences derived from uvm_sequence_item, discussing parameters and characteristics.
Illustrates an example related to Sequences.
Details the sequential steps to create, configure, and start a sequence.
Discusses the initial step of sequence creation.
Details on configuring a sequence: start values and loop variables.
How to call the start() method to execute the sequence.
Defines the workflow from sequence item creation to getting the response.
Describes the two types of execution flows: linear and parallel.
Presents coding best practices to avoid common pitfalls in sequence execution.
Introduces the two types of overrides in sequences.
Details about Sequence Type Factory Override.
Details about Sequence Instance Factory Override.
Thank you message and conclusion of the presentation.
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UVM: Basic Sequences
- 1. Any use ofthis 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
- 3. Sequence Item Arrow DevicesPvt Ltd
- 4. Sequence Item Content SequenceItem 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.
- 6. Example: Sequence Item Arrow Devices Pvt Ltd
- 7. Arrow Devices PvtLtd Sequence Item Methods
- 8.
- 9. Arrow Devices PvtLtd 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 PvtLtd Sequencer-‐Driver Connec7on
- 11. ArrowDevices 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 PvtLtd Recommended Driver-‐Sequencer API Ø get_next_item() followed by item_done() Ø get(req) followed by put(rsp) 1 2
- 13. Arrow DevicesPvt Ltd “get_next_item()” followed by “item_done()” 1
- 14. Arrow Devices PvtLtd “get(req)” followed by “put(rsp)” 2
- 15. Arrow Devices PvtLtd Sequences
- 16. ArrowDevices 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 PvtLtd Example: Sequences
- 18. Arrow Devices PvtLtd Running a Sequence Ø Step 1: Create Sequence Ø Step 2: Configure Sequence Ø Step 3: Start the Sequence
- 19. Arrow Devices PvtLtd Step 1: Create Sequence
- 20. Arrow Devices PvtLtd 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 PvtLtd Step 3: Start Sequence • Call to its start() method
- 22. Arrow Devices PvtLtd 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 PvtLtd Sequence Execu7on Flow Sequences have two types of execution Ø Linear Execution Flow Ø Parallel Execution Flow
- 24. Arrow Devices PvtLtd 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 PvtLtd Sequences Overrides Two types of overrides: Ø Sequence Type Factory Override Ø Sequence Instance Factory Override
- 26. Arrow Devices PvtLtd Sequence Type Factory Override
- 27. Arrow Devices PvtLtd Sequence Instance Factory Override
- 28. Thank you ArrowDevices Pvt Ltd