标题: | 考虑耦合电容以降低功率消耗的资料传输编解码之有效方法 An Effective Amount-Driven Encoding/Decoding Method (ADEM) for Low-Power Data Bus with Coupling |
作者: | 蔡明宪 Tsai Ming Hsien 陈正 Prof. Chen Cheng 资讯科学与工程研究所 |
关键字: | 省电;耦合;编码;汇流排;low power;coupling;encoding;spacing;bus |
公开日期: | 2005 |
摘要: | 由于制程的进步,电路愈益精密,汇流排的长度也越来越长。而在汇流排中,线路间的距离也越来越短,其间所产生的寄生电容值则增大,使得其每次的充放电事件消耗了更多的电能。因此,如何同时降低自生电容与耦合电容在汇流排中所消耗的电能,成为一个很重要的课题。我们在本篇论文中,提出一个方法amount-driven encoding method (ADEM),针对on-chip的资料汇流排所消耗的电能进行改善,藉由整合资料编码与Spacing的技术来达到此目标。我们将汇流排中的线路视为两两成对的相邻线路,且没有交集。再利用Spacing的技术以减小此成对的线路间所产生的耦合电容值,并对此成对之线路中的资料以四种编码方式进行编码,同时降低在此成对线路中自生电容与耦合电容所发生的充放电事件次数,进而达到低功率消耗的目标。我们模拟常见的多媒体档案在汇流排中传输所消耗的电能,结果显示ADEM在低功率消耗的效能上达到了25%的改进。相较于过去的相关研究,除了节省了更多的耗能,我们在电路复杂度与时间延迟方面,也有较好的表现。 As technology trends advancing, the increased bus length and the narrower geometrical proximity of adjacent bus lines form non-negligible coupling capacitances between two adjacent bus lines. Therefore, more power dissipation is caused by charge and discharge of the coupling capacitances. In this case, the effect of line-to-ground and coupling capacitances plays an important role for low-power bus system. In this thesis, we propose an integrated method, named amount-driven encoding method (ADEM), which minimizes the power dissipation of on-chip data buses through combining bus encoding and Spacing mechanisms. In our bus model, the bus lines are considered as the constitution of several adjacent pairs without intersection. Spacing mechanism is applied to decrease the values of coupling capacitances between pairs. For coupling capacitances between two adjacent lines within a pair, we reduce the charge and discharge times of them by applying four encoding methods in each bus cycle. Our method saves more than 25% of bus power on average compared to the un-encoded cases by transferring a large set of common used multimedia files on the bus. Comparing to previous work, ADEM saves more power effectively with a little overhead of circuit complexity and delay time. |
URI: | http://140.113.39.130/cdrfb3/record/nctu/#GT009317617 http://hdl.handle.net/11536/78829 |
显示于类别: | Thesis |
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