Direct memory access controller, corresponding method and computer program

Abstract

The invention relates to an access controller which comprises a module () for managing writing in a circular buffer (), means () for storing a first read pointer (PL) and a second write pointer (PE), a module () for managing reading in the circular buffer (), means () for blocking reading, respectively writing, means () for storing a read or write work pointer (PT) which is different from the first and second pointers (PL; PE), and means () for updating the wo: pointer (PT) according to a predetermined update logic. The predetermined update logic comprises forward or backward movements of the work pointer (PT) inside the circular buffer (), and the controller includes means for blocking the read or write work pointer if the read work pointer (PT) points outside a memory space reserved for reading or, respectively, if the write work pointer (PT) points outside a free memory space for writing.