本論文記錄了將MP3 player進行porting使之可以在ARM 9平台上執行的詳細過程；對Versatile VPB926EJS 發展板的AACI、MMU、I-Cache、D-Cache、DMA、I-TCM、D-TCM等裝置做驅動的工作，並且降低ARM926EJ CPU的Clock Rate，使MP3 Player的軟體能夠在最低的Clock Rate，使用最少的硬體資源即可以順暢的執行。

This paper has mentioned the detailed process in which MP3 has been porting so as to being executed on the plate of ARM9 and working device of AACI、MMU、I-Cache、D-Cache、DMA、I-TCM、D-TCM on the developing board of Versatile VPB926EJS; the device has reduced clock Rate of ARM926EJ CPU. On the basis of lowest Clock Rate, the software of MP3 player could be executed smoothly with the little hardware resource.

中文摘要………………………………………………………………1
Abstract………………………………………………………………2
一、 簡介…………………………………………………………6
1. MP3編碼�解碼的簡介.............................6
2. 常見的MP3加速方法介紹………………………………….8

二、 實作…………………………………………………………9
1. AACI驅動程式的編寫………………………………………10
2. DMAC的驅動程式……………………………………………18
3. MMU的設定…………………………………………………28

三、 實驗結果………………………………………………… 36
1. 最差狀況…………………………………………………36
2. 測試DMA的重要性…………………………………………36
3. 找出那一種加速效果最好………………………………37
4. 透過各種組合找出能夠Real-time Play的組合………38
5. 降低CPU的處理速度，找出最低的Clock Rate需求…39

四、 結論………………………………………………………41

參考文獻………………………………………………………………42

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