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The SP16 processor executes typical signal-processing tasks efficiently by overlapping in each processor cycle four functions: instruction prefetching, data-memory access and transfer of one data word over a single data bus, ALU operation, and multiplication. Despite SP16 being a one-address machine with a single data bus, it can perform filter operations with a multiplication and ALU operation in every processor cycle.
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Ungerboeck et al. (2005) studied this question.