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ARM9
The 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.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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