Minimization of I/O Delay in the architectural synthesis of DSP data flow graphs

This paper presents a new technique for the minimization of I/O delay in the architectural synthesis of cyclic data flow graphs (DFG) representing DSP algorithms taking into consideration the inter-processor communication delays. In this paper, the question of optimizing the I/O delay without scarifying the iteration period (throughput) with non-negligible inter-processor communication overhead is addressed. The proposed technique operating on the cyclic DFG of a DSP algorithm is designed to evaluate the relative firing times of the nodes by using Floyd-Warshall´s longest path algorithm so that the inter-processor communication overhead is taken into consideration to provide an optimized time and processor schedule. Moreover, the proposed scheme is applied to well- know DSP benchmarks and seen that it is efficient in minimizing the I/O delay without scarifying the iteration period.