SD卡接口规范的完整翻译,非常好，我做sd卡硬件时就是参考这个的。-SD Card Interface Specification complete translation, very good, and I do sd card hardware this is the reference.

SD2.0协议，完成的SD2.0协议文档，3部分(The information contained herein is presented only as a standard specification for SD Card and SD Host/Ancillary products. No responsibility is assumed by SD Card Association for any damages, any infringements of patents or