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UNIVERSITA’ POLITECNICA DELLE MARCHE, ANCONA (ITALY)

UNIVERSITA’ POLITECNICA DELLE MARCHE, ANCONA (ITALY). Massimo Conti, Giovanni Vece EXTENSION OF SYSTEMC FRAMEWORK TOWARDS POWER ANALYSIS: THE PKTOOL SIMULATION ENVIROMENT. 20. European SystemC User’s Group Meeting, December 1st, 2009, Grenoble. INTRODUCTORY OVERVIEW.

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UNIVERSITA’ POLITECNICA DELLE MARCHE, ANCONA (ITALY)

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  1. UNIVERSITA’ POLITECNICA DELLE MARCHE, ANCONA (ITALY) Massimo Conti, Giovanni Vece EXTENSION OF SYSTEMC FRAMEWORK TOWARDS POWER ANALYSIS: THE PKTOOL SIMULATION ENVIROMENT 20. European SystemC User’s Group Meeting, December 1st, 2009, Grenoble

  2. INTRODUCTORY OVERVIEW • PKtool (Power Kernel tool) is a power analysis tool recently developed by Università Politecnica delle Marche. • Mainly dedicated to power estimation for systems modelled in SystemC/C++ language. • Entirely realized in SystemC/C++, as a language extension for power analysis. • Distributed through free of charge open source releases ( downloadable from http://www.deit.univpm.it/PKtool ) 20. European SystemC User’s Group Meeting, December 1st, 2009, Grenoble

  3. MAIN MOTIVATIONS Power dissipation represents a primary design issue, making it worthwhile to explore possible SystemC extensions for power analysis. Providing an istrument for direct power analysis within a SystemC-based design. Promoting the diffusion and use of SystemC language. SystemC basic language power analysis extension verification library customized user extension TLM framework AMS extension 20. European SystemC User’s Group Meeting, December 1st, 2009, Grenoble

  4. SystemC basic framework Elementary channels Data types Core functionalities C++ language standard PKtool environment Power_modules Power models Aug. signals Kernel IMPLEMENTATION APPROACHPKtool is implemented according to the typical SystemC modeling paradigm: • BENEFITS:unified design context, no need of ad hoc execution tools,, . wide chances for interoperability and user enhancements, • LIMITATIONS: Constraint in functionality realization. 20. European SystemC User’s Group Meeting, December 1st, 2009, Grenoble

  5. PRIMARY TARGETS IN PKTOOL DEVELOPMENT REFERENCE FEATURES • GENERALE AND FLEXIBILE METHODOLOGY • FULL INTEGRATION IN A SYSTEMC-BASED DESIGN FLUX • USER-FRIENDLY APPLICATION MODALITIES - LOW SIMULATION OVERHEAD ISSUES TO BE FACED - TRADE-OFF CONDITIONS FOR THE REFERENCE FEATURES • FURTHER RESTRICTIONS COMING FROM IMPLEMENTATION CONSTRAINTS 20. European SystemC User’s Group Meeting, December 1st, 2009, Grenoble

  6. sc_module #1 sc_module #4 PKTOOL SIMULATOR POWER ESTIMATION #1 POWER ESTIMATION #2 POWER ESTIMATION #3 sc_module #3 sc_module #2 APPLICATION MODALITIES • PKtool can be applied on the single sc_modules constituting a SystemC description of the system. • The simulation results are given by the power/energy estimations of each monitored sc_module, reported in apposite text files. SIMULATION RESULTS SYSTEMC DESCRIPTION 20. European SystemC User’s Group Meeting, December 1st, 2009, Grenoble

  7. sc_module #1 sc_module #4 power_module #1 power_module #4 sc_module #3 sc_module #2 power_module #3 power_module #2 INSTANCE OF POWER_MODULES POWER_MODULE INSTANCE • A single sc_module is selected for PKtool simulations by instancing a corresponding power_module. • Instance example : master m1, m2; POWER_MODULE(master) m1, m2; ORIGINAL SYSTEMC DESCRIPTION SYSTEMC DESCRIPTION WITH POWER_MODULES 20. European SystemC User’s Group Meeting, December 1st, 2009, Grenoble

  8. POWER MODELS IN PKTOOL ENVIRONMENT • Entities used for estimating power dissipation within PKtool environment. • Formal representations of the power dissipated by a digital system (usually an approximation of the real dissipation). • PKtool makes available several power models included inside a customized model library. • The PKtool model library is an extensible entity where new power models can be defined. 20. European SystemC User’s Group Meeting, December 1st, 2009, Grenoble

  9. POWER MODELS CURRENTLY AVAILABLE PKtool model library signal-based power models operator-based power models FUTURE EVOLUTION Definition and integration of power models for TLM and AMS applications. table-based power models switching activity power models 20. European SystemC User’s Group Meeting, December 1st, 2009, Grenoble

  10. power model model formulation model data = = = + + + power model model formulation model formulation model data model data model formulation power model model data power model POWER MODEL CHARACTERIZATION • A power model can be conveniently characterized through two distinct components: - model formulation (computations, algorithmic steps, ...) - model data • Model data can be subdivided into two categories: - static data: data known a priori, available before the beginning of a simulation (example: technology parameters). - dynamic data : data available only during simulation, on the basis of the run-time evolution(example: signal activity). • Model data are specified by means of different solutions, according to their nature. + = 20. European SystemC User’s Group Meeting, December 1st, 2009, Grenoble

  11. AUGMENTED SIGNALS • PKtool components aimed to compute dynamic data related to signals ( I/O ports and internal nodes). • Signals alternative to traditional signals, with additional capabilities for computing dynamic data. • Instance task based on a simple type replacement of traditional signals (addition of the ending word “_aug” on the original type). Example of augmented signal instances sc_in< int > in_port ; sc_in_aug< int > in_port ; sc_unsigned addr ; sc_unsigned_aug addr; (original signals) (augmented signals) 20. European SystemC User’s Group Meeting, December 1st, 2009, Grenoble

  12. power model #1 power model #2 power model #4 power model #3 power_module #2 POWER MODEL SELECTION power_module #1 power_module #4 • Each power_module has to be associated to a power model of the PKtool model library. • The association task is carried out via an interactive procedure, at the beginning of a simulation. power_module #3 PKTOOL MODEL LIBRARY SYSTEMC DESCRIPTION WITH POWER_MODULES 20. European SystemC User’s Group Meeting, December 1st, 2009, Grenoble

  13. power model PKtool simulation dynamic data SystemC simulation static data PKTOOL SIMULATION FLUX • A PKtool simulation takes place during an ordinary SystemC simulation of the system. • The power estimations are referred to the system evolution reproduced in the SystemC simulation. power estimation time Start of SystemC simulation End of SystemC simulation 20. European SystemC User’s Group Meeting, December 1st, 2009, Grenoble

  14. RESEARCH ACTIVITIES WHERE PKTOOL HAS BEEN APPLIED • POWER PERFORMANCES OF COMMUNICATION STANDARDS: BLUETOOTH WIRELESS PROTOCOL ZIGBEE WIRELESS PROTOCOL AMBA AHB BUS • POWER-AWARE ARCHITECTURE EVALUATIONS DCT AND IDCT ALGORITHMS FOR H264/AVC STANDARD RETINEX ALGORITHMS FOR IMAGE PROCESSING 20. European SystemC User’s Group Meeting, December 1st, 2009, Grenoble

  15. APPLICATION EXAMPLE ON THE PERFORMANCES OF BLUETOOTH COMMUNICATION BLUETOOTH MASTER BLUETOOTH SLAVE BLUETOOTH SLAVE BLUETOOTH SLAVE APPLIED POWER MODEL E = energy dissipated Vdd = power supply Ceq = average gate capacitance Ng = number of gates D = average commutations per gate SIMULATION SCENARIO TESTBENCH (HCI LAYER) CHANNEL

  16. SOME ANALYSIS RESULTS FHS_tx others Receiver components Counter Access_code_rx Header_rx CRC_rx FEC_rx Arg_rx FEC_rx Transmitter components FEC_tx CRC_tx Data_tx FHS_tx Header_tx Sync_data_out Sync_data_in Sync data_out Access code_rx CRC_rx Counter Energy dissipated by the functional components in the network creation Energy dissipated in the transmission of different packet formats

  17. PKTOOL REFERENCES ON THE WEB OFFICIAL WEB-SITE: http://www.deit.univpm.it/PKtool SOURCEFORGE SITE: http://sourceforge.net/projects/pktool 20. European SystemC User’s Group Meeting, December 1st, 2009, Grenoble

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