JISE


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Journal of Information Science and Engineering, Vol. 22 No. 4, pp. 941-952


A Brief Comparison of Two-phase and NOR-based Four-phase Pipelined Asynchronous Systems

Ying-Haw Shu, Shing Tenqchen1, Ming-Chang Sun and Wu-Shiung Feng2 
Department of Electrical Engineering 
National Taiwan University 
Taipei, 106 Taiwan 
1Chunghwa Telecom Telecommunication Labs. 
Taoyuan, 326 Taiwan 
E-mail: stc@cht.com.tw 
2Department of Electronics Engineering 
Chang Gung University 
Taoyuan, 333 Taiwan

    Two-phase micro-pipeline asynchronous modules show faster performance than common four-phase control systems, but the conventional systems with multi-port modules normally suffer from long signal paths on stacked C-elements. NOR-based control schemes provide an alternative solution to problems such as propagation delay. This paper compares modified versions of these two popular pipelined systems. HSPICE simulation results show the two-phase pipelined system is still a reliable solution with a limited number of inputs even when the theoretically lower control overhead is disregarded. A power reduction of over 27% and a propagation improvement of more than 11% were achieved by replacing some decision circuits with modified C-elements.

Keywords: interlocked pipelined CMOS, two-phase pipeline, symmetric C-element, strobe, asynchronous

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