This article present an original hardware task model and the corresponding online API for Fine Grained Dynamically Reconfigurable Architecture. We cover the integration of this API in the OLLAF platform and more specifically its application to memory access management in a dynamically reconfigurable environment. Methods offered by this platform are compared to existing software and hardware solutions. We also discuss of the design complexity of an application using difference solutions. We demonstrate that our solution cans give application developer the same flexibility than with a software implementation, with a very close design complexity while ensuring the same performance gain a common FPGA based IP would permit.