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Os motores de busca de Datasheet de Componentes eletrônicos |
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Os motores de busca de Datasheet de Componentes eletrônicos |
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MC12H064NBCA-2SA00 Folha de dados(PDF) 8 Page - Samsung semiconductor |
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MC12H064NBCA-2SA00 Folha de dados(HTML) 8 Page - Samsung semiconductor |
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8 / 102 page  MultiMediaCardTM 8 Sep.22.2005 Revision 0.3 3.8 MultiMediaCard Mode The SAMSUNG MultiMediaCard is fully compliant with MultiMediaCard standard specification V4.1 3.8.1 MultiMediaCard Standard Compliance The MultiMediaCard supports the operation condition verification sequence defined in the MultiMediaCard standard spec- ifications. The MultiMediaCard host should define an operating voltage range that is not supported by the MultiMedi- aCard. It will put itself in an inactive state and ignore any bus communication. The only way to get the card out of the inactive state is by powering it down and up again. In addtion the host can explicitly send the card to the inactive state by using the GO_INACTIVE_STATE command. 3.8.2 Negotiating Operation Conditions MultiMediaCard status is stored in a 32 bit status register which is sent as the data field in the card respond to host com- mands. Status register provides information about the card’s current state and completion codes for the last host com- mand. The card status can be explicityly read(polled) with the SEND_STATUS command. 3.8.3 Card Status The basic unit of data transfer to/from the MultiMediaCard is one byte. All data transfer operations which require a block size always define block lenghs as integer multiples of bytes. Some special funcions need other partition granularity. For block oriented commands, the following definition is used: • Block: is the unit which is related to the block oriented read and write commands. Its size is the number of bytes which will be transferred when one block command is sent by host. The size of a block is either programmable or fixed. The information about allowed block sizes and the programmability is stored in the CSD. For R/W cards, special erase and write protect commands are defined: • The granularity of the erasable units is the Erase Group: The smallest number of consecutive write blocks which can be addressed for erase. The size of the Erase Group is card specific and stored in the CSD. • The granularity of the Write Protected units is the WP-Group: The minimal unit which may be individually write pro- tected. Its size is defined in units of erase groups. The size of a WP-Group is card specific and stored in the CSD. 3.8.4 Memory Array Partitioning The MultiMediaCard supports two read/write modes. In this mode the host reads or write one data block in a pre-specified length block transmission is protected with 16bit CRC which is generated by the sending unit and checked by the receiveing unit. Misalignment is not allowed. Every data block must be contained in a single memroy sector. The block lenght for write opertaion must be identical to the sector size and the start address aligned to a sector boundary. Single Block Mode 3.8.5 Read and Write Operations |
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