關於PXA26x與PXA255 internal bus速度

Luzofan

先前看到電子時報有一篇PXA255與PXA26x系列比較的文章 :
  
http://patlab.digitimes.com.tw/extract/extract.asp?extid=131&gid=29  
  
其中提到, PXA26x系列的internal bus為200MHz, 與一直以來以為是100Mhz的印象不太一樣. 因此特地download一本"Intel[$reg] PXA26x Processor Family Developer's Manual"來翻翻看, 於page 3-3, Clock Manager有以下敘述:
  
"The PXbus is the internal bus between the core, the DMA/bridge, the LCD controller, and the memory controller as shown in Figure 3-1. This bus is clocked at 1/2 the run mode frequency. For optimal performance, the PXbus should be clocked as fast as possible. For example, if a target core frequency of 200 MHz is desired use 200-MHz run mode instead of 200-MHz turbo mode with run at 100 MHz. Increasing the PXbus frequency may help reduce the latency involved in accessing non-cacheable memory"
  
故PXA263的internal bus速度也和PXA255一樣為200MHz, 我以前曾提到100Mhz是有誤的. 若有誤導網友的地方, 敬請自行於腦中更正......