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MC56U032DCCA Datasheet(PDF) 9 Page - Samsung semiconductor |
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MC56U032DCCA Datasheet(HTML) 9 Page - Samsung semiconductor |
9 / 64 page MultiMediaCard TM 2.6.5 Memory Array Partitioning Although the MultiMediaCard memory space is byte addressable with addresses ranging from 0 to the last byte, it is not a simple byte array but divided into several structures. Memory bytes are grouped into 512 byte blocks called sectors. Every block can be read, written individually. Erase group is a number of sectors. Its size is the number of consecutive sectors. Any combination of erase groups can be erased in a single erase command. A write command implicitly erases the memory before writing new data into it. Explicit erase command can be used for pre-erasing of memory to speed up the next write operation. Write Protect Groups (WPG) is the minimal units that may have individual write protection. Its size is the number of erase units that will be write protected by on bit. The write/erase access to each WPG can be limited individually. The number of various memory structures, for the different MultiMediaCards are summarized in Table 2-1. Table 2-1 Memory Array Structure Bytes 32MB 64MB 128MB Sectors 62,720 125,440 250,880 Erase Group 1,960 3,920 7,840 WPG 490 980 1,960 Read and Write Operations The MultiMediaCard supports two read/write modes. Single Block Mode In this mode the host reads or writes one data block in a pre-specified length block transmission is protected with 16 bit CRC which is generated by the sending unit and checked by the receiving unit. Misalignment is not allowed. Every data block must be contained in a single memory sector. The block length for write operations must be identical to the sector size and the start address aligned to a sector boundary. Multiple Block Mode This mode is similar to the single block mode, but the host can read/write multiple data blocks (all have the same length) which will be stored or retrieved from contiguous memory addresses starting at the address specified in the command. The operation is terminated with a stop transmission command. Misalignment and block length restrictions apply to multiple blocks as well and are identical to the single block read/write operations. Multiple block read with pre-defined block is supported. 2.6.6 Data Protection in the Flash Card Every sector is protected with an Error Correction Code (ECC). The ECC is generated (in the memory card) when the sectors are written and validated when the data is read. If defects are found, the data is corrected prior to transmission to the host. The MultiMediaCard can be considered error free and no additional data protection is needed. However, if an application uses additional, external, ECC protection, the data organization is defined in the user writeable section of the CSD register 2.6.7 Erase 9 |
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