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MC56U128HBCC-0QC00 Datasheet(PDF) 37 Page - Samsung semiconductor |
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MC56U128HBCC-0QC00 Datasheet(HTML) 37 Page - Samsung semiconductor |
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37 / 66 page  MultiMediaCard TM 37 defined. The card will continuously transfer data blocks until a stop transmission command is received. * Multiple block read with pre-defined block count : The card will transfer the requested number of data blocks, terminate the transaction and return to transfer state. Stop command is not required at the end of this type of multiple block read, unless terminated with an error. In other to start multiple block read with pre-defined block count, the host must use the SET_BLOCK COUNT command(CMD23) immediately preceding the READ_MULTIPLE_BLOCK(CMD18) command. Otherwise this card will start an open-ended multiple block read which can be stopped using the STOP_TRANSMISSION command. 4.9.2 Block Write Block write (CMD24 - 27) means that one or more blocks of data are transferred from the host to the card with a CRC appended to the end of each block by the host. A card supporting block write must always be able to accept a block of data defined by WRITE_BLK_LEN. If the CRC fails, the card will indicate the failure on the DAT line; the transferred data will be discarded and not written and all further transmitted blocks (in multiple block write mode) will be ignored. The write operation will also be aborted if the host tries to write over a write-protected area. In this case, however, the card will set the WP_VIOLATION bit. Programming of the CID and CSD register does not require a previous block length setting. The transferred data is also CRC protected. The MultiMediaCard write operation follows some special rules: WRITE_MULTIPLE_BLOCK(CMD25) starts a transfer of several consecutive blocks. Two types of multiple block write transactions, identical to the multiple block read, are defined (the host can use either on at any time) * Open-ended Multiple block write : The number of blocks for the write multiple block operation is not defined. The card will continuously accept and program data block until a stop transmission command is received. * Multiple block write with pre-defined block count : The card will transfer the requested number of data blocks, terminate the transaction and return to transfer state. Stop command is not required at the end of this type of multiple block write, unless terminated with an error. In other to start multiple block write with pre-defined block count, the host must use the SET_BLOCK COUNT command(CMD23) immediately preceding the WRITE_MULTIPLE_BLOCK(CMD25) command. Otherwise this card will start an open-ended multiple block write which can be stopped using the STOP_TRANSMISSION command. The host can abort writing at any time, within a multiple block operation regardless of the its type. Transaction abort is done by sending the stop transmission command. If a multiple block write with predefined block count is aborted, the data in the remaining blocks is not defined. 4.9.3 Erase The erasable unit is the Erase Group. Erase group is measured in write blocks which are the basic writable units of the card. The size of the Erase group is a card specific parameter and defined in the CSD. The host can erase a contiguous range of Erase Groups. Starting the erase process is a three steps sequence. First the host defines the start address of the range using the ERASE_GROUP_START(CMD35) command, next it defines the last address of the range using the |
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