文件名称：SD Memory Card Specifications
文件大小：647KB
文件格式：PDF
更新时间：2018-01-24 10:05:27
SD spec
SD Memory Card (Secure Digital Memory Card) is a Flash-Based memory card that is specifically designed to meet the security, capacity, performance and environment requirements inherent in newly emerging audio and video consumer electronic devices. The SD Memory Card will include a copyright protection mechanism that complies with the security of the SDMI standard and will be faster and capable for higher Memory capacity. The SD Memory Card security system uses mutual authentication and a "new cipher algorithm" to protect from illegal usage of the card content. A none 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 MultiMediaCard with some additions. The SD Memory Card communication is based on an advanced 9-pin interface (Clock, Command, 4xData and 3xPower lines) designed to operate in a low voltage range. The communication protocol is defined as a part of this specification. The SD Memory Card host interface supports regular MultiMediaCard operation as well. In other words, MultiMediaCard forward compatibility was kept. Actually the main difference between SD Memory Card and MultiMediaCard is the initialization process.