Bridge is a behavioral synthesis system being developed at AT&T Bell Laboratories. In this system, a variable in a behavioral description can be either a storage element or a signal. The impact of treating a variable as a signal on lifetime analysis is discussed. The feature of supporting both signals and registers for program variables facilitates systematic exploitation of tradeoffs between cost and performance. Intelligent bindings of the variables in a behavioral description to registers and signals not only reduce the implementation cost but also improve the circuit performance. Experimental data for the descriptions of three telecommunication circuits are presented.
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