sd-card reader procedures, sd model (four data lines), is the general pattern of about 20 six times. and full sd card data sheet

Packet : 97288413sd(sd_4_data_mode).rar filelist
SD_Simplified_Physical_Layer_Specification.pdf
SD_Spec.pdf
Simplified_SDIO_Card_Specification.pdf
sd_mem.h
sd_mem.c

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