Workshop - November Toulouse Architecture exploration and optimisation of a flexible signal processing unit Jean BERTRAND, Jérémie POULY – CNES Axel BONESS, François BERTRAND – CEA LETI

Workshop - November Goals Evaluate SoCKET tools capacity to support architecture exploration Constraints Need to achieve meaningful technical work Specific tools required Small team involved Choice of « easy » exploration For verification of results To ease success

Workshop - November Design under improvement VECTOR MAGNETOMETER YOU NAME ITNULL FIELD MAGNETOMETER

Workshop - November Design overview Design with large datapath 48 bit endpoint, 104 at most Multiplier/accumulator/shifter structure Micro-programmable Task scheduling BUT: Computational performance depend on I/O throughput HENCE : Good arbiter (also) needed

Workshop - November Constraints As our design prones reconfigurability : any application is candidate Model Input Arbiter (to score) Application Ouput Metrics

Workshop - November SystemC-TLM-TAC needs To be correctly installed and configured Some parts are not painless Users have to Master C++ Understand SystemC/TLM/TAC hierarchy and components Users should be seasoned in these fields Users must be confident with the design

Workshop - November TAC & architecture exploration Design of model is the important stage Data collection is not built-in We had to implement our specific outputs Model is communication based therefore good candidate for TLM-TAC modeling Model evolution easy (arbiter switch) Simulation campaign easy with unix scripting

Workshop - November What was scored ? Tough I/O application identified In two different kind of applications Three different arbiters Round Robin Time slot FIFO Allows different parameters Priorized FIFO

Workshop - November Results RECS1 time slot arbiter

Workshop - November Results RECS2-4 time slot arbiter

Workshop - November Scoring of arbiters

Workshop - November Results : analysis Technical result : priorized FIFO arbiter is the best Modelisation results easy to obtain Ease of characterization of several arbiters

Workshop - November Synthesis Architecture exploration succeeded Results were meaningful and relevant When TAC API is mastered, development is an easy process Excellent ratio time taken/risks leveraged given initial training and seasoning Modelisation environment mastering as lengthy ROI

Workshop - November Questions