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The Memory-Processor Gap

The Memory-Processor Gap. Processor speed increases by 60% per year while memory access speed increase is 10% Most techniques focus on latency tolerance which exposes bandwidth limitations The most obvious solution is to reduce traffic to off-chip memory. IRAM Architecture. FlexRAM Design.

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The Memory-Processor Gap

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  1. The Memory-Processor Gap • Processor speed increases by 60% per year while memory access speed increase is 10% • Most techniques focus on latency tolerance which exposes bandwidth limitations • The most obvious solution is to reduce traffic to off-chip memory

  2. IRAM Architecture

  3. FlexRAM Design

  4. DIVA Project

  5. Active Pages

  6. On-chip DRAM cache Compatible with current architecture Allows bigger caches in same die area Reduces processor-memory gap problem by reducing traffic to off-chip memory FPGA-based chip Uses standard FPGA chips Allows good memory and logic locality Eliminates difference in fabrication problem Integrates memory and logic onto a single chip easily Experimental Plans

  7. Conclusions • Memory-logic integration is possibly the best solution • Much more research still needs to be done in this area • There are several options that are relatively unexplored • Research must continue in this area as the memory-processor gap widens every year

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