论文标题

与单元i $ _ \ text {c} $排名的低成本超导粉丝。

Low-Cost Superconducting Fan-Out with Cell I$_\text{C}$ Ranking

论文作者

Volk, Jennifer, Tzimpragos, George, Wynn, Alex, Golden, Evan, Sherwood, Timothy

论文摘要

超导体电子设备(SCE)承诺的计算机系统具有比其互补的金属氧化物半导体(CMOS)对应物更高速度和低能消耗的计算机系统。同时,超导系统的可扩展性和资源利用是主要问题。其中一些问题来自设备级别的挑战以及SCE和CMOS技术节点之间的差距,而另一些问题来自Josephson交界处(JJS)的方式。为此,我们注意到,逻辑操作不涉及大量硬件资源,而是用于粉丝和缓冲目的。在本文中,我们询问是否有一种减少这些开销的方法,建议在单元边界上使用JJS来增加单个阶段可以驱动的输出数量,并建立一组规则,以有利于该分配的方式离散临界电流。最后,我们探索了设计的权衡,即提出的方法通过详细的模拟模拟和建模分析来展示其承诺。我们的实验表明,引入的方法可在JJ计数中节省48%的粉丝,其粉丝为1024,而信号分开的JJ计数的平均为43%,而在ISCAS'85基准测试中的时钟分配为32%。

Superconductor electronics (SCE) promise computer systems with orders of magnitude higher speeds and lower energy consumption than their complementary metal-oxide semiconductor (CMOS) counterparts. At the same time, the scalability and resource utilization of superconducting systems are major concerns. Some of these concerns come from device-level challenges and the gap between SCE and CMOS technology nodes, and others come from the way Josephson Junctions (JJs) are used. Towards this end, we notice that a considerable fraction of hardware resources are not involved in logic operations, but rather are used for fan-out and buffering purposes. In this paper, we ask if there is a way to reduce these overheads, propose the use of JJs at the cell boundaries to increase the number of outputs that a single stage can drive, and establish a set of rules to discretize critical currents in a way that is conducive to this assignment. Finally, we explore the design trade-offs that the presented approach opens up and demonstrate its promise through detailed analog simulations and modeling analyses. Our experiments indicate that the introduced method leads to a 48% savings in the JJ count for a tree with a fan-out of 1024, as well as an average of 43% of the JJ count for signal splitting and 32% for clock splitting in ISCAS'85 benchmarks.

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