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ESL: Panacea or Hype?

FERMAT | Sandeep Shukla | June 2005 {shukla}@vt.edu. ESL: Panacea or Hype?. Acknowledgement: NSF, Project Espresso @IRISA, FERMAT @Virginia Tech, and the “Chip Design” Magazine. Outline. Pictures speak louder than words What is ESL? Abstraction Trends Verification Trends

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ESL: Panacea or Hype?

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  1. FERMAT | Sandeep Shukla | June 2005 {shukla}@vt.edu ESL: Panacea or Hype? Acknowledgement: NSF, Project Espresso @IRISA, FERMAT @Virginia Tech, and the “Chip Design” Magazine

  2. Outline • Pictures speak louder than words • What is ESL? • Abstraction Trends • Verification Trends • EDA Industry Trends • What are we doing? • Heterogeneity and MoCs • Behavioral Hierarchy • Meta Modeling Support • Service Oriented Validation Framework

  3. Electronic System Level?

  4. Abstraction Trends

  5. Hardware Resources and Computer Power

  6. A Tale of Two ESLs?

  7. HW/SW Cost Breakdown Trends

  8. Verification Trends

  9. Hybrid and AMS

  10. Verification Trends

  11. ESL Industry Space

  12. Our Work at FERMAT and ESPRESSO • Introduce Heterogeneity in SystemC with Models of Computation (MoC) extensions • Raise the Modeling Fidelity • Step towards Behavioral Hierarchy with Heterogeneity • EWD: Meta-Modeling Frameworks • CARH: Service Oriented Validation Framework

  13. SystemC’s Discrete-Event Kernel • Evaluate-Update Paradigm • Dynamic scheduling incurs unnecessary delta cycles • Statically schedulable MoCs should avoid dynamic scheduling

  14. An Example MoC Extension: Synchronous Data Flow in SystemC • SDF models are: • Amenable to static scheduling • Require blocks to have predefined production and consumption rates • Construct repetition vector • Construct firing order • Executable schedule achieved with valid repetition vector and firing order

  15. An Example MoC Extension: Synchronous Data Flow in SystemC SC_MODULE( sdf_block ) { SDFPort< sc_uint< 8 > > sample_in; SDFPort< sc_uint< 8 > > sample_out; SC_SDF_METHOD( block_entry ); SC_CTOR( sdf_block ) { // Register this block into sdf_graph } void block_entry() { // Entry specific code } }; SC_MODULE( toplevel ) { sc_in_clk CLK; SC_THREAD( topentry ) { sensitive << CLK.pos(); }; SC_CTOR ( toplevel ) { // Instantiate SDF blocks and connect // the ports } void topentry() { sdf_trigger(); } }; • Constructing an SDF model requires: • Encapsulating SDF specific processes (SC_SDF_METHOD) in a top-level SystemC process • Top-level constructs SDF graph with appropriate API • Every unique SDF model must be registered in its own sdf_graph instance • Top-level entry function must invoke sdf_trigger() function

  16. An Example MoC Extension: Synchronous Data Flow in SystemC • During initialization all executable schedules are computed • DE kernel continues executes without intervention until sdf_trigger() is invoked • SDF kernel takes over and executes the SDF-specific blocks according to the computed schedule

  17. Heterogeneous ExtensionsCommunicating Sequential Processes Fork2 • Rendez-vous communication Fork1 Phil3 Phil2 Fork3 Footman Phil4 Phil1 Fork0 Phil0 Fork4

  18. s0 s1 s2 s3 s4 Heterogeneous ExtensionsFinite State Machine Fork2 • Control machines Fork1 Phil3 Phil2 Fork3 Footman Phil4 Phil1 Fork0 Phil0 Fork4

  19. SDF: Producer/Consumer Producer Consumer Heterogeneous ExtensionsDE, FSM, SDF & CSP Fork2 DE: Solves RSA Encryption Algorithm Fork1 Phil3 Phil2 Fork3 SDF: Sobel Edge Detection Algorithm Footman Phil4 Phil1 Fork0 Phil0 Fork4

  20. Simulation EfficiencyA brief look • Pure SDF models ~ 65% gains • Pure FSM models ~ 10% degradation • Pure CSP models ~ 1% gains

  21. Behavioral Hierarchy with Heterogeneity • Decompose design into small behaviors • Behaviors expressed by different MoCs

  22. Behavioral Hierarchy with Heterogeneity • Semantics define interactions within MoC and across MoCs • Hierarchical composition preserves behavioral hierarchy

  23. Doxygen Annotated XML Why you want GreenSocs • SystemCXML: http://systemcxml.sourceforge.net SystemC Source Phase 1 Extracted XML Phase 2 IR Analysis, Transformation, Testing, Optimization, …

  24. What we do with SystemC? • Service-oriented architecture • Provide infrastructure for incorporating multiple features into services using ACE/TAO • Use SCV for automated testbench generation • Dynamic-Value Change Dump • Logging Service • Employ existing CORBA services such as: • Naming Service • Event Service

  25. Meta Modeling

  26. Reference • Website for SystemC-H: http://fermat.ece.vt.edu/systemc-h/ • Book

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