Memory access unit for selectively accessing static or dynamic memory has external address bus used for addressing static memory or dynamic memory in dependence on internal address word

摘要

The memory access unit (100) has an internal address bus (150), for providing an internal address word, an internal data bus (152), for providing an internal data word, an external address bus (108) for addressing a static memory or a dynamic memory in 2 different operating modes and an external data bus (104) for data transfer to or from the memory. The internal address words are stored in an address register (154), with a data register (156,158) holding the data to be transferred to or from the external data bus, each register coupled to the internal address bus and the internal data bus. An Independent claim for a method for selectively accessing a static or dynamic memory is also included.