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i.MX, i.MX1, i.MXL, i.MXS, applications processor
Using SDIO with SDHC in the i.MX Applications ProcessorsFreescale Semiconductor Inc.The MMC/SD physical specifications support two operation modes, SD transfer mode and SPI transfer mode. The Multimedia Card/Secure Digital Host Controller (SDHC) designed in the i.MX processors integrate MMC support with SD memory and, I/O functions. The I/O function supported follows the SPI transfer mode. However, the SPI mode relies on the i.MX processor’s embedded SPI module. The disadvantage of using the SPI is the loss of performance of the SPI transfer mode versus SD transfer mode (for example a single data line and hardware Chip Select signal per card). This application note attempts to resolve the I/O and socket connections issue.
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