A self-timed approach to VLSI digital filter design

A request-acknowledge protocol is normally used for self-timed digital design. The two major philosophies for such a protocol are two-cycle and four-cycle. Data flow graphs have seven primitives. The design of these primitives for both two-cycle and four-cycle protocols is presented. Results of simulations of a multirate comb filter used as a decimator for both of these schemes are also presented. The authors demonstrate not only the efficacy of the synthesis procedure considered but also the improved efficiency of the two-cycle scheme over the four-cycle scheme