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MMC 规范 (MultimediaCard)

2008-7-3 14:57:19  3409
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<p><font face="Verdana">MMC 规范 (MultimediaCard)</font><br/></p>
<p><font face="Verdana">System Summary<br/>MMCA Technical Committee<br/>Based on System Specification Version 2.11</font><br/></p>
<p><font face="Verdana">System Features<br/>? Targeted for portable and stationary applications<br/>? Voltage range for communication: 2.0 - 3.6V. For memory access: card specific range<br/>(subrange of the communication voltage range)<br/>? Designed for read-only, read/write and I/O cards<br/>? Variable clock rate 0 - 20 MHZ<br/>? Maximum data rate with up to 10 cards<br/>? Password protection of data<br/>? Basic file formats for high data interchangeability<br/>? Application specific commands<br/>? Correction of memory field errors<br/>? System macro library for easy card stack handling available<br/>? Optional data cache to enhance the access peRFormance<br/>? Built-in write protection features (permanent and temporary)<br/>? Comfortable erase mechanism<br/>? Protocol dependent attributes of the communication channel:<br/>MultiMediaCard Mode SPI Mode<br/>Three-wire serial data bus (clock, command,<br/>data)<br/>Three-wire serial data bus (clock, dataIn,<br/>dataOut) + card specific CS signal.<br/>Up to 64k cards addressable by the bus<br/>protocol<br/>Card selection via a hardware CS signal<br/>Up to 30 cards stackable on a single physical<br/>bus<br/>Card stacks require a “per card” CS signal.<br/>Easy card identification Not available<br/>Error-protected data transfer Optional. A non-protected data transfer<br/>mode is available.<br/>Sequential and single/multiple block oriented<br/>data transfer<br/>Single block read/write</font></p><br/>
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2008-7-3 14:57:19   评论 分享淘帖
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thank you
2008-8-1 13:31:11 评论

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非常不错 值得注册
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