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SFQ standard cell-based circuit design of an internal link speeded-up Batcher-Banyan packet switch

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3 Author(s)
Kameda, Y. ; Fundamental Res. Labs., NEC Corp., Ibaraki, Japan ; Yorozu, S. ; Tahara, Shuichi

We are developing a single-flux-quantum (SFQ) packet switch for over 1-Tb/s switching systems. Investigation of several switch topologies leads us to select the Batcher-Banyan packet switch because of its simplicity and regularity. The packet switch structure we propose consists of simple 2×2 unit switches each connected by speeded-up internal links. Numeric simulation showed that the speeded-up links greatly improved the throughput by resolving packet blocking, which is a major drawback of the Banyan switch. High throughput compatible to a crossbar switch was attained by using links whose speed was quadrupled. Moreover, the throughput did not decrease even though the number of input/output ports increased. Taking the speed of SFQ basic gates into account, the cycle time of the 2×2 unit switch reaches 25 ps, which is sufficient to achieve the 40-GHz operation. If unit switches are connected by quadrupled internal links, the Batcher-Banyan switch can accept the 10-Gb/s external input rate per channel. This indicates that the total throughput of a 128×128 switch exceeds 1 Tb/s. The unit switch was designed down to the SFQ gate level. To design a large SFQ circuit, we built several “standard” SFQ cells whose shape was square or rectangular with a unit width and height. Such shapes make it easier to place and connect a number of cells. We show some experimental results of testing SFQ standard cells and logic circuits

Published in:

Applied Superconductivity, IEEE Transactions on  (Volume:11 ,  Issue: 1 )

Date of Publication:

Mar 2001

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