Hello @niramlkumar.r and welcome to the Community :),
The IDMA is enabled by the IDMAEN bit in SDMMC_IDMACTRLR register.
The different IDMA modes are details in the RM0438 and precisely SDMMC DMA control register (SDMMC_IDMACTRLR) Section.
I advise you to take look at the FatFs_uSD_DMA example may help you in your implementation.
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Kaouthar
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