MMC 规范 (MultimediaCard)

2008-7-3 14:57:19 4212

0 MMC 规范 (MultimediaCard) System Summary MMCA Technical Committee Based on System Specification Version 2.11 System Features ? Targeted for portable and stationary applications ? Voltage range for communication: 2.0 - 3.6V. For memory access: card specific range (subrange of the communication voltage range) ? Designed for read-only, read/write and I/O cards ? Variable clock rate 0 - 20 MHZ ? Maximum data rate with up to 10 cards ? Password protection of data ? Basic file formats for high data interchangeability ? Application specific commands ? Correction of memory field errors ? System macro library for easy card stack handling available ? Optional data cache to enhance the access peRFormance ? Built-in write protection features (permanent and temporary) ? Comfortable erase mechanism ? Protocol dependent attributes of the communication channel: MultiMediaCard Mode SPI Mode Three-wire serial data bus (clock, command, data) Three-wire serial data bus (clock, dataIn, dataOut) + card specific CS signal. Up to 64k cards addressable by the bus protocol Card selection via a hardware CS signal Up to 30 cards stackable on a single physical bus Card stacks require a “per card” CS signal. Easy card identification Not available Error-protected data transfer Optional. A non-protected data transfer mode is available. Sequential and single/multiple block oriented data transfer Single block read/write 0 本帖子中包含更多资源您需要登录才可以下载或查看，没有帐号？注册 x
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