Hardware Development Guide of Module Product
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3.6.2
Electric Feature
SDCC_CLK: Clock signal, host2device, default is 0~25MHz.
SDCC_CMD: Command/response, two-way: the command can sent from the host
to a single card/all cards, the response is sent from a single card/all cards to the
host.
SDCC_DATA[3..0]: Data cable, two-way, default is 0~12.5MB/sec.
3.6.3
Application of SD Card Interface
Figure 3-3 is the reference design diagram for the SD interface. The detection of SD
card adopts the polling mode of DATA3 signal cable to judge whether T card is
inserted or not.
Figure 3-3 SD Typical Application Circuit