Memory bank customization and assignment in behavioral synthesis

With increasing design complexity and chip area, on-chip memory has become an important component whose integration needs to be addressed during system design. Modern embedded DRAM technology allows for large amounts of on-chip memory space. However, in order to utilize the available memory intelligently, the memory has to be appropriately customized for the specific application. We address the topic of incorporating the application-specific customization of memory bank configuration into behavioral synthesis. The strategy involves a partitioning of behavioral arrays into memory banks based on a cost function that estimates the performance implications. For a given candidate partition, we present a heuristic for determining the access sequence that minimizes page misses in a bank while respecting data dependences. The output of the exploration is a graph displaying the variation of delay and memory area with the bank configuration. Our experiments on several memory-intensive examples confirm that the exploration results can provide critical feedback to the designer about the optimal memory configuration for a given application.