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Aggregated CDMA crossbar for Network-on-Chip

机译：片上网络的聚合CDMA交叉开关

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Code Division Multiple Access (CDMA) is proposed as the physical layer enabler of Network-On-Chip (NoC) interconnects for its prominent features such as fixed latency, guaranteed service, and reduced system complexity. CDMA interconnects have been adopted by the NoC community as it originates in wireless communications where each bit in a CDMA encoded data word is transmitted on a separate channel to avoid interference. However, the wireless interference problem can be efficiently mitigated in on-chip interconnects eliminating the need for replicating the CDMA channel. Moreover, wireless channels are sequential by nature which is not the case in on-chip interconnects where parallel buses are the default communication means. After CDMA was adopted by the NoC community, the same wireless CDMA scheme has been maintained where each data bit is encoded in a separate CDMA channel and the encoding/decoding logic is replicated for data packets. In this work, we present a novel CDMA encoding/decoding scheme called Aggregated CDMA (ACDMA) for NoC interconnects in which all packet bits are encoded in a single CDMA channel, consequently, eliminating the area and energy overheads resulted from replicating the channel encoding/decoding logic. The ACDMA NoC crossbar is synthesized on a 45-nm standard-cell process. Compared to the conventional CDMA NoC crossbars, the presented method achieves 60.5% less area, 55% less power consumption, and 124% more throughput per area ratio.
机译：提议使用码分多址（CDMA）作为片上网络（NoC）互连的物理层使能器，因为它具有诸如固定等待时间，有保证的服务以及降低的系统复杂性等突出特征。 CDMA互连已被NoC社区采用，因为它起源于无线通信，其中CDMA编码数据字中的每个比特都在单独的信道上传输以避免干扰。但是，可以在片上互连中有效地缓解无线干扰问题，从而无需复制CDMA信道。而且，无线信道本质上是顺序的，而在片上互连中，并行总线是默认的通信方式，情况并非如此。在NoC社区采用CDMA之后，维护了相同的无线CDMA方案，其中每个数据位都在单独的CDMA通道中编码，并且编码/解码逻辑被复制用于数据包。在这项工作中，我们提出了一种适用于NoC互连的，称为聚合CDMA（ACDMA）的新颖CDMA编码/解码方案，其中所有数据包位都在单个CDMA通道中进行编码，因此，消除了由于复制通道编码/而导致的面积和能量开销解码逻辑。 ACDMA NoC交叉开关是在45纳米标准单元工艺上合成的。与传统的CDMA NoC交叉开关相比，该方法实现了每面积比减少60.5％的面积，减少55％的功耗以及增加124％的吞吐量。

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