我看SD卡使用手册，看到SD卡供电上升时间，有点疑惑。
下面有两个截图，手册上说，
Initialization delay:
The maximum of
1 msec, 74 clock cycles
and supply ramp up time
还说，After power up, the host starts the clock and sends the initializing sequence on the CMD line. This sequence is a
contiguous stream of logical ‘1’s. The sequence length is the maximum of 1msec, 74 clocks or the supply-ramp-uptime;
the additional 10 clocks (over the 64 clocks after what the card should be ready for communication) is
provided to eliminate power-up synchronization problems.
我想说说我的想法，大家看看对不对。
SD卡上升时间最大1MS，在这1MS中，数据线上连续的发逻辑1信号，也就是高电平，时钟要至少74个。
请各位大侠斧正，谢谢！ |
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