论文标题

基于磁性隧道连接器的缩放布尔旋转电路的视角和挑战

Perspectives and Challenges of Scaled Boolean Spintronic Circuits Based on Magnetic Tunnel Junction Transducers

论文作者

Meng, F., Lee, S. -Y., Zografos, O., Gupta, M., Nguyen, V. D., De Micheli, G., Cotofana, S., Asselberghs, I., Adelmann, C., Kar, G. Sankar, Couet, S., Ciubotaru, F.

论文摘要

本文解决了一个问题:基于磁性隧道连接(MTJ)换能器的旋转电路是否优于其最先进的CMOS对应物?为此,我们使用EPFL组合基准集合,在7 nm CMO和基于MTJ的Spintronic Technologies中合成它们,并根据能量延迟产品(EDP)比较两种实现方法。为了充分利用技术潜力,CMO和Spintronic实现分别建立在标准布尔和多数门上。 For the spintronic circuits, we assumed that domain conversion (electric/magnetic to magnetic/electric) is performed by means of MTJs and the computation is accomplished by domain wall based majority gates, and considered two EDP estimation scenarios: (i) Uniform Benchmarking, which ignores the circuit's internal structure and only includes domain transducers power and delay contributions into the calculations, and (ii) Majority-Inverter-Graph Benchmarking, which还嵌入了电路结构,相关的临界路径延迟和DW传播的能量消耗。我们的结果表明,对于统一的情况,Spintronic途径更适合实施很少的输入和输出的复杂电路。另一方面,当还通过多数和逆变器综合考虑电路结构时,我们的分析清楚地表明,为了匹配并最终超越CMOS性能,MTJ效率必须提高3-4个数量级。虽然很明显,目前是基于MTJ的自发性方式无法与CMO竞争,但进一步的传感器的开发可能会使平衡倾斜,而当与信息的非挥发性结合使用时,可能会对某些应用程序进行旋转实现,这些应用程序需要大量计算并且与环境的相互作用相当有限。

This paper addresses the question: Can spintronic circuits based on Magnetic Tunnel Junction (MTJ) transducers outperform their state-of-the-art CMOS counterparts? To this end, we use the EPFL combinational benchmark sets, synthesize them in 7 nm CMOS and in MTJ-based spintronic technologies, and compare the two implementation methods in terms of Energy-Delay-Product (EDP). To fully utilize the technologies potential, CMOS and spintronic implementations are built upon standard Boolean and Majority Gates, respectively. For the spintronic circuits, we assumed that domain conversion (electric/magnetic to magnetic/electric) is performed by means of MTJs and the computation is accomplished by domain wall based majority gates, and considered two EDP estimation scenarios: (i) Uniform Benchmarking, which ignores the circuit's internal structure and only includes domain transducers power and delay contributions into the calculations, and (ii) Majority-Inverter-Graph Benchmarking, which also embeds the circuit structure, the associated critical path delay and energy consumption by DW propagation. Our results indicate that for the uniform case, the spintronic route is better suited for the implementation of complex circuits with few inputs and outputs. On the other hand, when the circuit structure is also considered via majority and inverter synthesis, our analysis clearly indicates that in order to match and eventually outperform CMOS performance, MTJ efficiency has to be improved by 3-4 orders of magnitude. While it is clear that for the time being the MTJ-based-spintronic way cannot compete with CMOS, further transducer developments may tip the balance, which, when combined with information non-volatility, may make spintronic implementation for certain applications that require a large number of calculations and have a rather limited amount of interaction with the environment.

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