Behavioral optimization using the manipulation of timing constraints

— We introduce a transformation, named rephasing, that manipulates the timing parameters in control-data-flow graphs (CDFG’s) during the high-level synthesis of data-pathintensive applications. Timing parameters in such CDFG’s include the sample period, the latencies between input–output pairs, the relative times at which corresponding samples become available on different inputs, and the relative times at which the corresponding samples become available at the delay nodes. While some of the timing parameters may be constrained by performance requirements, or by the interface to the external world, others remain free to be chosen during the process of high-level synthesis. Traditionally high-level synthesis systems for data-pathintensive applications either have assumed that all the relative times, called phases, when corresponding samples are available at input and delay nodes are zero (i.e., all input and delay node samples enter at the initial cycle of the schedule) or have...

• Type: Journal
• Year: 1998
• Where: TCAD
• Authors: Miodrag Potkonjak, Mani B. Srivastava
• Keywords: Data-pathintensive Applications, Relative Times, TCAD 1998, Timing Parameters