Arithmetic element controller for controlling data, control and micro

Abstract

An arithmetic element controller which provides for memory address generation for three independent memories of a signal processor and for direct memory access from external devices by way of an interface to the control and data store memories. The arithmetic element controller comprises a first address generator which includes a general purpose address generator circuit and three separate address generator circuits which generates memory addresses for data store, control store and micro store memories, respectively. A second address generator comprises two address generator circuit which comprise memory address logic that generate memory addresses that permit direct memory addressing of the control store and data store memories by way of the interface. A memory access controller is coupled to the two address generators to control access to the respective data store and control store memories by the respective address generators. The memory access controller comprises arbitration logic which arbitrates between requests for data store memory access and control store memory access. The second address generator comprises a cache memory which stores sets of control parameters provided by the control store memory, which control parameters comprise segment, offset bias and word count data. An adder, which adds the offset and segment parameters to generate a data store memory address,and decrementing logic utilizes the count parameter to determine the number of words to transfer to the data store memory. A second adder combines the bias and offset parameters to provide a new offset which is stored in the cache memory.