Placement and Routing Methods Based on Mixed Wiring of JTLs and PTLs for RSFQ circuits
Placement and Routing Methods Based on Mixed Wiring of JTLs and PTLs for RSFQ circuits
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DOI：
10.1109/isec46533.2019.8990903
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发表时间：
2019-07
期刊：
影响因子：
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通讯作者：
Takashi Dejima;K. Takagi;N. Takagi
中科院分区：
文献类型：
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作者：
Takashi Dejima;K. Takagi;N. Takagi
我们提出了集成在快速单通量量子（RSFQ）电路的自动布局设计流程中的放置和路由方法。为了实现小电路面积和低时延，互连采用约瑟夫森传输线（JTLs）和无源传输线（PTLs）。放置和路由是考虑正确使用jtl和ptl来执行的。为了减少计算成本，将放置问题划分为子问题。放置方法由三个步骤组成，即(i) Cell聚类，（ii）每个集群中的Cell放置和JTL路由，以及（iii）集群放置。集群间的路由通过物理带库实现。我们将提出的设计流程应用于具有数百个栅极的采样电路。虽然电路面积没有得到充分优化，但用该方法设计的电路的延迟比手工设计的电路要小。
We propose placement and routing methods integrated in automated layout design flow for rapid single-flux-quantum (RSFQ) circuits. In order to realize small circuit area and low latency, both Josephson transmission lines (JTLs) and passive transmission lines (PTLs) are used for interconnects. Placement and routing are performed considering proper use of JTLs and PTLs. The placement problem is divided into subproblems in order to reduce the computational cost. The placement method is composed of three steps, i.e., (i) Cell clustering, (ii) Cell placement and JTL routing in each cluster, and (iii) Cluster placement. Routing among clusters are performed using PTLs. We applied the proposed design flow to sample circuits with several hundreds of gates. Though the circuit area is not fully optimized, the latency of the circuits designed with the proposed methods are smaller than those of the circuits designed manually.