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What is the host controller?

SD Host Controller

SD Standards Make Product Design Easier

The SD host controller specification manages both SD memory card standards and SDIO card standards. This simplifies host system and driver designs by using a standardized implementation that reduces product development time. It defines a standard register set to control SD memory card and SDIO card standards.

The specification also provides a sophisticated direct memory access function to achieve high-performance data transfers between SD standard host systems and memory cards. Largely because of hardware control, SD transfers data without having to rely on the CPU specifications.

Simplified Version of SD Host Controller Spec