文件名称:mmc_high_speed_mode_setting_sequence_v1.0
- 所属分类：
- 单片机(51,AVR,MSP430等)
- 资源属性：
- [PDF]
- 上传时间：
- 2012-11-26
- 文件大小：
- 418kb
- 下载次数：
- 0次
- 提 供 者：
- simpl*****
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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.
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