Host-Zugriff zu gemeinschaftlichem Speicher mit Hochprioritätsbetriebsart

A digital system is provided with a memory (42) that can be shared by two or more data requestors (10, 20). Two modes of access are provided. In a shared access memory (SAM) access mode, all of the data requestors can sequentially access the memory. In a host only memory (HOM) access mode, the memory is connected directly to one of the requestors, such as a host processor (10), so that high bandwidth transfers can be performed. The HOM access mode is entered when a priority assigned to the host processor is set to be higher than a priority assigned to any other requestor. Registers for holding the priority assignments can be written by at least one of the requesters.