Novel Delay Elements for Bundled-Data Transfer Circuits Based on Two-Phase Handshaking Protocols
Novel Delay Elements for Bundled-Data Transfer Circuits Based on Two-Phase Handshaking Protocols
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DOI：
10.1109/async.2018.00012
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发表时间：
2018-05
期刊：
影响因子：
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通讯作者：
Masashi Imai;Shinichiro Akasaka;T. Yoneda
中科院分区：
文献类型：
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作者：
Masashi Imai;Shinichiro Akasaka;T. Yoneda
由于延迟元件是VLSI设计中的一个基本元件，因此人们对它们进行了深入的研究。然而，对于上升时延和下降时延都必须大于相应组合电路的临界路径时延的两相握手协议，如何设计最优的时延元件还不是很清楚。本文提出了一种基于两相握手协议的捆绑数据传输电路的新型延迟元件。通常，组合电路的关键路径可能会因环境变化而改变。应综合考虑各种环境变化，选择最优的静态延迟元件。此外，延迟变化很大程度上取决于晶体管的大小和电路结构。为了减小延迟元件与相应组合电路之间变化特性的差异，提出了一种由多个沟道长度最小的深堆栈晶体管组成的电路结构。给出了使用28 nm工艺技术的几个评估结果。
A number of delay elements have been well studied since they are a basic component in VLSI designs. However, it is not clear how to design the optimum delay elements for the two-phase handshaking protocol in which both the rising delay and the falling delay must be larger than the critical path delay of the corresponding combinational circuit. In this paper, novel delay elements for bundled-data transfer circuits based on the two-phase handshaking protocol are proposed. Generally, critical paths of a combinational circuit may be varied due to environmental changes. The optimum static delay elements should be selected considering all the environmental changes. In addition, delay variations strongly depend on the transistor size and the circuit structure. In this paper, a circuit structure which contains several deep stack transistors with the minimum channel length is proposed in order to reduce the differences of the variation features between the delay elements and the corresponding combinational circuits. Several evaluation results are shown using the 28nm process technology.