ARM9

ARM9 is a group of older 32-bit RISC ARM processor cores licensed by ARM Holdings.

Overview

With this design generation, ARM moved from a von Neumann architecture (Princeton architecture) to a Harvard architecture with separate instruction and data buses (and caches), significantly increasing its potential speed. Most silicon chips integrating these cores will package them as modified Harvard architecture chips, combining the two address buses on the other side of separated CPU caches and tightly coupled memories.

There are two subfamilies, implementing different ARM architecture versions.

Differences from ARM7 cores

Key improvements over ARM7 cores, enabled by spending more transistors, include:

List of ARM microarchitectures

This is a list of microarchitectures based on the ARM family of instruction sets designed by ARM Holdings and 3rd parties, sorted by version of the ARM instruction set, release and name. ARM provides a summary of the numerous vendors who implement ARM cores in their design.Keil also provides a somewhat newer summary of vendors of ARM based processors. ARM further provides a chart displaying an overview of the ARM processor lineup with performance and functionality versus capabilities for the more recent ARM core families.

ARM cores

Designed by ARM

Designed by third parties

These cores implement the ARM instruction set, and were developed independently by companies with an architectural license from ARM.

ARM core timeline

The following table lists each core by the year it was announced.

See also

References

Further reading