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Most modern processor cores can process instructions and data much faster than off-chip memory systems can deliver them. Caches and Tightly Coupled Memories (TCMs) are different methods of improving system performance when the external memory is narrow, slower than the core, or both.
Caches and TCMs are small, fast memories closely coupled with the processor. They can:
enable good system performance even with slow or narrow off-chip memory
reduce total system power consumption by reducing off-chip memory accesses.
An uncached core is normally a better choice if off-chip memory is as fast as the core, and 32 bits wide.
| Copyright © 1999-2001 ARM Limited. All rights reserved. | ARM DUI 0056D |
| Non-Confidential | |
| PDF version | |
| Home > Caches and Tightly Coupled Memories > About caches and tightly coupled memory |