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                dma有burst、burst size、transfer的概念: ## dma 實際上是一次一次的申請總線,把要傳的數據總量分成一個一個小的數據塊。比如要傳64個字節,那么dma內部可能分為2次,一次傳 64/2=32個字節,這個2(a)次呢,就叫做burst。這個burst是可以設置的。這32個字節又可以分為32位 \* 8或者16位\*16來傳輸。 ## transfer size: 就是數據寬度,比如8位、32位,一般跟外設的FIFO相同。 ## burst size: 就是一次傳幾個 transfer size. ![](https://img.kancloud.cn/4d/02/4d024f752b0113b7f71cceb50dc512a8_849x683.png)
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