内容简介 ：
Introduction
By using more transistors to implement a more sophisticated design, the ARM9TDMI
and ARM9E-S cores provide over twice the performance than the ARM7TDMI and
ARM7TDMI-S cores, when compared on the same silicon process. The performance
improvements come from a combination of increased clock frequency and decreased
number of clock cycles to execute some frequently occurring instructions1.
For brevity this document will use the term “the seven cores” to refer to the ARM7TDMI
and ARM7TDMI-S cores collectively, and the term “the nine cores” to refer to the
ARM9TDMI and ARM9E-S collectively.