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上传时间: 2012-07-23
详细说明： The Secure Digital Card is a flash-based memory card that is specifically designed to meet the security, capacity, performance and environmental requirements inherent in newly emerging audio and video consumer electronic devices. The SD Card includes a copyright protection mech anism that complies with the security of the SDMI standard, and is faster and capable of higher Memory capacity. The SD Card security system uses mutual authentication and a “new cipher algor ithm” to protect from illegal usage of the card content . A non-secured access to the user‘s own content is also available. The physical form factor, pin assignment and data transfer protocol are forward compatible with the SD Card, with some additions. The SD Card communication is based on an advanced nine-pin interface (Clock, Command, 4xData and 3xPower lines) designed to operate in a low voltage range. The communication protocol is defined as part of this specification. The SD Card host interface supports regular MultiMediaCard operation as well. In other words, MultiMediaCard forward compatibility was kept. Actually the main difference between SD Card and MultiMediaCard is the initialization process. The SD Card specifications were originally defined by MEI (Matsushita Electric Company) , Toshiba Corporation and SanDisk Corporation. Currently, the specifications are controlled by the Secure Digital Association (SDA). The SanDisk SD Card was designed to be compatible with the SD Card Physical Specification. ...展开收缩
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