Processors Investigate

The Scratchpad Memory Management Unit for Microblaze: Implementation, Testing, and Case Study

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Executive Summary

This paper proposes the Scratchpad Memory Management Unit (SMMU) to act as a perfect data cache for a known subset of the data used by a program. This enables the execution time for each load or store operation in the program to be precisely determined. The SMMU must be explicitly controlled by the program, which commands the addition and removal of objects from the SMMU and its associated scratchpad memory. This paper explains why the SMMU enables memories with high access latency to be used efficiently within hard real-time embedded systems. It describes the SMMU in abstract form, explaining how it solves the memory latency and pointer aliasing problems and how programs could use it.

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