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SDHC with simple DMA?

Question asked by zhenq li on Nov 27, 2013
Latest reply on Nov 28, 2013 by zhenq li

      hi,I use the simple DMA mode of the SDHC' internal DMA with Vybrid Tower.The OS is MQX 4.0.2.When I select "DDR debug" with IAR,the file in the SD card was not written or readed correctly.But,when I select "Int Ram debug",the file was written or readed correctly.On the datasheet <vybrid Reference manual> page 2742,it say "the SDHC internal DMA does support  a virtual memory system".I want to know ,how to use simple DMA in DDR mode with Vybrid Tower system?