C79458-L7000-B126 上電后，ADS5422一直工作，采樣產生的數據是否存儲到IDT72V2113中，由 C6203B的DX0引腳狀態來決定。C6203B進行初始化，外部擴展總線的XCE3設置為同步FIFO讀操作模式。DMA通道0配置為每次傳輸1幀，每幀 1024個半字，同步事件設置為外部中斷4，觸發極性為高電平，初始化定時器0，定時間隔為22ms。當外部同步信號到來時，啟動定時器0，手動啟動 DMA通道0，同時設置DX0為低電平。
ADS5422采樣產生的數據開始寫入IDT72V2113，當定時器0中斷到來時，設置DX0為高電平，關閉 IDT72V2113的寫使能，采樣數據不再存儲到IDT72V2113內。隨著數據不斷寫入IDT72V2113，當其內部的數據量大于1023個半字時，IDT72V2113的將空標志信號（PAE）由低電平變為高電平，使得C6203B的外部中斷信號有效，從而觸發DMA傳輸，C6203B的DMA 通道0通過外部擴展總線（XB）讀取1024個半字的數據，存儲于內部RAM中，傳輸結束后向C6203B發送中斷，通知C6203B處理數據。 C6203B處理完數據后，通過USB2.0接口發送處理結果，然后重新啟動DMA通道0，進行下一次DMA傳輸。如此循環，直到處理完所有數據。當下一個外部同步信號到來時，進行下一輪數據采集處理過程。
本文詳細介紹了基于USB2.0接口和DSP的高速數據采集處理系統的系統構成、硬件連接以及USB2.0驅動程序和固件程序的開發。經實際驗證，系統運行可靠，是一種比較好的高速數據采集與處理的解決方案。
C79458-L7000-B126
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