LLDRAM-Ⅲ『RMHE41A364AGBG』Exact Match Search Solution
This document isanoverview of Exact Match Search Solution using Renesas Low-Latency-DRAM『LLDRAM-III』.
In recent years,network-virtualization is evolving by new technology such as SDN『Software-Defined Networking』and NFV『Network Functions Virtualization』.To realize SDN,Openflow®specificationis constantly being updated with new functions.Data-plane hardware such as router or switch is requested to implement above new functions. Although NFV data-planefunctions can beimplemented by software using microprocessors,networksystem performance may suffer due to slow software processing. Figure-1 shows one of the solution to achieve both flexible functionalityand high performance. Network equipment by FPGA enables theimplementation ofnew programmable functionsandthe executionof high speed packet processing at same time.
On the other handone of the crucial bottlenecks of data-plane hardwareis packet header search speed.Network equipment search for the information corresponding to packet header from search database and then transfer the received packet to destination host by executing packet processing according to search result information.Search database on network equipment is becoming more large scale because of the increasing network traffic and the requirement of more complex search table for security applications, etc.Large scale search databases from thousands to hundreds of thousands of entries are hard for FPGA devices to search at high search rate.Therefore special off-load search engine chip is often used for these solutions.
Exact Match Search Solution using『LLDRAM-III』is a search-engine to upgrade search performance for network system implemented by FPGA. Instead of usingspecial off-load search engine, this solution usesa combination of Search IPimplemented in FPGA and LLDRAM-III for database storage.LLDRAM-III is low-latency DRAM developed by Renesas for network applications.
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Application note & Design Guide |
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Please see the document for details |
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English Chinese Chinese and English Japanese |
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May 31,2017 |
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Rev.2.00 |
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R10AN0010EJ0200 |
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890 KB |
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