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首页> 外文会议>2017 7th International Conference on Integrated Circuits, Design, and Verification >16.8 GB/s LPDDR4-3200@32-bit memory access bandwidth
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16.8 GB/s LPDDR4-3200@32-bit memory access bandwidth

机译：LPDDR4-3200 @ 32位内存访问带宽为16.8 GB / s

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摘要

Today's In-Vehicle Infotainment system requires more external memory access bandwidth (MABW) [1] especially for high definition (HD) video/audio. It demands maximum utilization for SDRAM access instead of expansion for SDRAM capacity due to limitation of chip size. An LPDDR4-3200 @32-bit SDRAM supports 12.8GB/s [2], and efficiency is limited to around 95% by SDRAM AC timing. An idea to achieve even more MABW than the limitation is introduced. Placing lossless compression unit [3] at source of requests, and decompression unit (DCU) integrated inside memory controller (MC), the number of SDRAM command has been deducted while increasing bus data bandwidth. However, latency becomes a critical issue for real-time request which may be non-decompression while going through DCU with big number of processing cycles. The adaptive solution is applied in this work so that both bandwidth and latency requirement are satisfied. The non-decompression transaction is separated and processed out-of-order to relax the latency, whereas the decompression transaction goes through DCU for decompression processing. Simulation result on LPDDR4-3200 @ 32-bit shows average 16.8 GB/s MABW for data rate after decompression using video playback data stream, with real-time requirement maintaining.
机译：当今的车载信息娱乐系统需要更多的外部存储器访问带宽（MABW）[1]，尤其是对于高清（HD）视频/音频。由于芯片尺寸的限制，它要求SDRAM访问的最大利用率而不是SDRAM容量的扩展。 LPDDR4-3200 @ 32位SDRAM支持12.8GB / s [2]，并且通过SDRAM AC时序将效率限制在95％左右。提出了实现比限制更多的MABW的想法。将无损压缩单元[3]放置在请求源处，并将解压缩单元（DCU）集成在内存控制器（MC）中，在增加总线数据带宽的同时，已减少了SDRAM命令的数量。但是，延迟成为实时请求的关键问题，在经过具有大量处理周期的DCU时，它可能是非解压缩的。在这项工作中采用了自适应解决方案，因此既满足带宽要求又满足延迟要求。非解压缩事务被分离并乱序处理以放松延迟，而解压缩事务则通过DCU进行解压缩处理。在LPDDR4-3200 @ 32位上的仿真结果显示，使用视频回放数据流进行解压缩后，数据速率平均为16.8 GB / s MABW，并保持实时要求。

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