Scratchpad memory (SPM), also known as scratchpad, scratchpad RAM or native store in pc terminology, is an internal memory, usually excessive-velocity, used for non permanent storage of calculations, knowledge, and different work in progress. In reference to a microprocessor (or CPU), scratchpad refers to a special high-pace memory used to hold small objects of knowledge for fast retrieval. It is similar to the utilization and measurement of a scratchpad in life: a pad of paper for preliminary notes or sketches or writings, and many others. When the scratchpad is a hidden portion of the main memory then it’s typically known as bump storage. L1 cache in that it is the subsequent closest memory to the ALU after the processor registers, with specific instructions to maneuver knowledge to and from major memory, typically utilizing DMA-primarily based information transfer. In distinction to a system that uses caches, a system with scratchpads is a system with non-uniform memory access (NUMA) latencies, because the memory entry latencies to the completely different scratchpads and the principle memory fluctuate.

Another distinction from a system that employs caches is that a scratchpad generally does not contain a replica of data that can be saved in the main Memory Wave. Scratchpads are employed for simplification of caching logic, and to ensure a unit can work without important memory contention in a system employing a number of processors, particularly in multiprocessor system-on-chip for embedded systems. They are mostly suited to storing momentary outcomes (because it would be found in the CPU stack) that usually wouldn’t need to always be committing to the primary memory