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CCS/AM1808: sata interface is always busy after performing a dma write

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Intellectual 780 points
Part Number: AM1808

Tool/software: Code Composer Studio

Hi,

     I want to use the sata interface of am1808 to operate a SSD. The driver i used was copied from the technical ref(section 29.3----use cases). Now i can spin-up the SSD, but the BSY bit of P0TFD is always '1' after perferming a dma write or read operation. what can cause this situation?

    Thanks.