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Title: mmc_high_speed_mode_setting_sequence_v1.0 Download
 Description: Normal MMC operates under 20 MHz and can operate 1 bit data, but High Speed MMC can operate from 0 to 52 MHz. Also it can operate 1 bit to 8 bit data Even though High Speed mode setting is defined in MMC specification 4.x, most application manufactures are violating High Speed mode setting sequence. Default HS_TIMING is 0. If you want to use High Speed MMC, you must change the default HS_TIMING to 1. If the HS_TIMING registry is not modified, then it is possible for the card to operate abnormally due to the lack of timing margin. Therefore, Samsung recommends following guideline for High speed mode setting sequence to manufactures for preventing compatibility failure.
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mmc_high_speed_mode_setting_sequence_v1.0.pdf
    

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