Embedded Systems Design Europe - August/September 2008 - (Page 34) multicore Here’s an example of how the Open Core Protocol was used to reconfigure the basic MIPS32 architecture to support cache-coherent traffic within an embedded multicore cluster. Achieving cache coherence in a MIPS32 BY MATTHIAS KNOTH multicore design H 34 034-035-036-037_ESDE.indd 34 istorically, memory coherence in multiprocessor systems was often achieved through bus “snooping,” where each core was connected to a common multitier bus and was able to snoop on memory-access traffic of processor peers to regulate the coherence status of individual cache lines. For that, each core maintained the coherence status of L1 cache lines locally and posted status changes to peers via the common bus. The increasing size and complexity of the systemon-a-chip (SoC) led to restructuring of the multitierbus philosophy in favor of localized point-to-point connections with centralized traffic routing. This configuration enabled speed and power improvements on now localized bus segments due to reduced load and segment length. Also, bus-contention problems eased, and throughput increased for the localized data exchange. In response to this trend in system architecture, the Open Core Protocol (OCP) standard emerged to AUGUST – SEPTEMBER 2008 | embedded systems design europe | www.embedded.com/europe 28/08/08 12:13:10 http://www.embedded.com/europe
Table of Contents Feed for the Digital Edition of Embedded Systems Design Europe - August/September 2008 Embedded Systems Design Europe - August/September 2008 Contents TI Overhauls DSP Lineup, Adds 15 Processors QNX Publishes Source Code for File System Congatec to Take on Proprietary Market Swiss Multicore Project Wins Microsoft Grant OpenCores Bundles Development Tool ARM Compiler Boosts Freescale i.MX31 LabVIEW Updated for Multicore and Wireless Cover Feature: Interactive Tool Supports Multiprocessor SoC Design Wanted: Benchmaking for Embedded VMM Hypervisors Graphical Design Empowers Spider Robots Building a Power Supply for Discontinuous Transmission Wireless Networks RTOS Selection & Best Practices Achieving Cache Coherence in a MIPS32 Multicore Design New Products Advertising Contacts Embedded Systems Design Europe - August/September 2008 Embedded Systems Design Europe - August/September 2008 - Embedded Systems Design Europe - August/September 2008 (Page Cover1) Embedded Systems Design Europe - August/September 2008 - Embedded Systems Design Europe - August/September 2008 (Page Cover2) Embedded Systems Design Europe - August/September 2008 - Contents (Page 3) Embedded Systems Design Europe - August/September 2008 - Contents (Page 4) Embedded Systems Design Europe - August/September 2008 - Contents (Page 5) Embedded Systems Design Europe - August/September 2008 - QNX Publishes Source Code for File System (Page 6) Embedded Systems Design Europe - August/September 2008 - QNX Publishes Source Code for File System (Page 7) Embedded Systems Design Europe - August/September 2008 - OpenCores Bundles Development Tool (Page 8) Embedded Systems Design Europe - August/September 2008 - OpenCores Bundles Development Tool (Page 9) Embedded Systems Design Europe - August/September 2008 - LabVIEW Updated for Multicore and Wireless (Page 10) Embedded Systems Design Europe - August/September 2008 - LabVIEW Updated for Multicore and Wireless (Page 11) Embedded Systems Design Europe - August/September 2008 - Cover Feature: Interactive Tool Supports Multiprocessor SoC Design (Page 12) Embedded Systems Design Europe - August/September 2008 - Cover Feature: Interactive Tool Supports Multiprocessor SoC Design (Page 13) Embedded Systems Design Europe - August/September 2008 - Cover Feature: Interactive Tool Supports Multiprocessor SoC Design (Page 14) Embedded Systems Design Europe - August/September 2008 - Cover Feature: Interactive Tool Supports Multiprocessor SoC Design (Page 15) Embedded Systems Design Europe - August/September 2008 - Cover Feature: Interactive Tool Supports Multiprocessor SoC Design (Page 16) Embedded Systems Design Europe - August/September 2008 - Cover Feature: Interactive Tool Supports Multiprocessor SoC Design (Page 17) Embedded Systems Design Europe - August/September 2008 - Cover Feature: Interactive Tool Supports Multiprocessor SoC Design (Page 18) Embedded Systems Design Europe - August/September 2008 - Cover Feature: Interactive Tool Supports Multiprocessor SoC Design (Page 19) Embedded Systems Design Europe - August/September 2008 - Wanted: Benchmaking for Embedded VMM Hypervisors (Page 20) Embedded Systems Design Europe - August/September 2008 - Wanted: Benchmaking for Embedded VMM Hypervisors (Page 21) Embedded Systems Design Europe - August/September 2008 - Graphical Design Empowers Spider Robots (Page 22) Embedded Systems Design Europe - August/September 2008 - Graphical Design Empowers Spider Robots (Page 23) Embedded Systems Design Europe - August/September 2008 - Building a Power Supply for Discontinuous Transmission Wireless Networks (Page 24) Embedded Systems Design Europe - August/September 2008 - Building a Power Supply for Discontinuous Transmission Wireless Networks (Page 25) Embedded Systems Design Europe - August/September 2008 - Building a Power Supply for Discontinuous Transmission Wireless Networks (Page 26) Embedded Systems Design Europe - August/September 2008 - Building a Power Supply for Discontinuous Transmission Wireless Networks (Page 27) Embedded Systems Design Europe - August/September 2008 - Building a Power Supply for Discontinuous Transmission Wireless Networks (Page 28) Embedded Systems Design Europe - August/September 2008 - Building a Power Supply for Discontinuous Transmission Wireless Networks (Page 29) Embedded Systems Design Europe - August/September 2008 - RTOS Selection & Best Practices (Page 30) Embedded Systems Design Europe - August/September 2008 - RTOS Selection & Best Practices (Page 31) Embedded Systems Design Europe - August/September 2008 - RTOS Selection & Best Practices (Page 32) Embedded Systems Design Europe - August/September 2008 - RTOS Selection & Best Practices (Page 33) Embedded Systems Design Europe - August/September 2008 - Achieving Cache Coherence in a MIPS32 Multicore Design (Page 34) Embedded Systems Design Europe - August/September 2008 - Achieving Cache Coherence in a MIPS32 Multicore Design (Page 35) Embedded Systems Design Europe - August/September 2008 - Achieving Cache Coherence in a MIPS32 Multicore Design (Page 36) Embedded Systems Design Europe - August/September 2008 - Achieving Cache Coherence in a MIPS32 Multicore Design (Page 37) Embedded Systems Design Europe - August/September 2008 - New Products (Page 38) Embedded Systems Design Europe - August/September 2008 - New Products (Page 39) Embedded Systems Design Europe - August/September 2008 - New Products (Page 40) Embedded Systems Design Europe - August/September 2008 - New Products (Page 41) Embedded Systems Design Europe - August/September 2008 - New Products (Page 42) Embedded Systems Design Europe - August/September 2008 - Advertising Contacts (Page 43) Embedded Systems Design Europe - August/September 2008 - Advertising Contacts (Page Cover4)
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