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MULTIPROCESSOR PROTOTYPE USING LEON AS BUILDING BLOCK

21st Nov, 2002 . Multiprocessor Prototype using LEON. Presentation Outline. Objective

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MULTIPROCESSOR PROTOTYPE USING LEON AS BUILDING BLOCK

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    1. MULTIPROCESSOR PROTOTYPE USING LEON AS BUILDING BLOCK A. Sai Pramod Kumar Embedded Systems Group Department of Computer Science & Engineering IIT Delhi 21st Nov, 2002

    2. 21st Nov, 2002 Multiprocessor Prototype using LEON Presentation Outline Objective & Motivation Phases Choices for multiprocessor systems Issues in building a multiprocessor Steps towards LEON multiprocessor Issues in Synthesis References

    3. 21st Nov, 2002 Multiprocessor Prototype using LEON Objective & Motivation Objective To build a shared memory multiprocessor using LEON processors as building blocks Motivation Real performance/cost nos. give valuable feedback to our tools Prototyping adds credibility to our work System design experience lets us identify new problems Working demonstrations help motivate new people

    4. 21st Nov, 2002 Multiprocessor Prototype using LEON Phases Initial Simulation using ModelSim Synthesis & Implementation on FPGA Case Studies

    5. 21st Nov, 2002 Multiprocessor Prototype using LEON Choices for multiprocessor systems

    6. 21st Nov, 2002 Multiprocessor Prototype using LEON Issues in building a shared memory multiprocessor Cache coherency Snoopy Invalidate Update Directory based Centralized Distributed

    7. 21st Nov, 2002 Multiprocessor Prototype using LEON Issues in building a shared memory multiprocessor Cache coherency Memory consistency model Processor Sequential Weak

    8. 21st Nov, 2002 Multiprocessor Prototype using LEON Issues in building a shared memory multiprocessor Cache coherency Memory consistency model Interconnection N/W allocation Static Fixed Priority Round Robin Dynamic LRU

    9. 21st Nov, 2002 Multiprocessor Prototype using LEON Multiprocessor Block Diagram

    10. 21st Nov, 2002 Multiprocessor Prototype using LEON LEON multiprocessor architectural decisions Shared memory Symmetric Homogeneous Interconnection through AHB Cache coherency Snoopy invalidate protocol Memory consistency model Has instructions for atomic load & stores, fence instructions

    11. 21st Nov, 2002 Multiprocessor Prototype using LEON Steps towards building multiprocessor

    12. 21st Nov, 2002 Multiprocessor Prototype using LEON Modify Boot Code in compliance with Intel MP Spec

    13. 21st Nov, 2002 Multiprocessor Prototype using LEON Modify Interrupt Controller

    14. 21st Nov, 2002 Multiprocessor Prototype using LEON Implement Semaphore Operations Using SPARC instruction set “Swap” instrn exchanges the contents of memory with contents of register atomically. Useful in InterProcess Communication

    15. 21st Nov, 2002 Multiprocessor Prototype using LEON Implementation of Lock Using Swap Instrn

    16. 21st Nov, 2002 Multiprocessor Prototype using LEON Debug Status Unit Allows non-intrusive debugging on target hardware. Uses dedicated UART to communicate to outside monitor.

    17. 21st Nov, 2002 Multiprocessor Prototype using LEON The synthesis flow

    19. 21st Nov, 2002 Multiprocessor Prototype using LEON What lead to move to Virtex-II Leon 2-1-0.4 along along with DSU succesfully booted on Virtex-I Even with the minimum possible BlockRAM settings, the device Virtex-I has no enough BlockRAM resources to support the multiprocessor configuration

    20. 21st Nov, 2002 Multiprocessor Prototype using LEON ZBT SRAM Write Timing Diagram

    21. 21st Nov, 2002 Multiprocessor Prototype using LEON LEON SRAM Write Timing diagram

    22. 21st Nov, 2002 Multiprocessor Prototype using LEON What is done Added proc id to PSR of each processor Added Boot register to AHB bus as slave Modified boot code in compliance with Intel MP Spec Modified interrupt controller Made multiprocessor boot & check the peripherals in simulations Made modifications to the disassembler in the simulator to suffix each instruction with the processor number on which it is executing. Implemented Semaphore Operations and tested them through Producer Consumer Problem on karnali(Sun Sparc) Made LEON + DSU boot on Virtex- I Made LEON + DSU boot on Virtex-II

    23. 21st Nov, 2002 Multiprocessor Prototype using LEON What has to be done Write a wrapper to LEON to make it compatible with the ZBT RAM in the ADM-XRC-II. Move the multiprocessor to Virtex-II Check for cache coherency Case studies JPEG Encoding

    24. 21st Nov, 2002 Multiprocessor Prototype using LEON References

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