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MC28U512HCFA-0QC00 数据表(PDF) 41 Page - Samsung semiconductor |
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MC28U512HCFA-0QC00 数据表(HTML) 41 Page - Samsung semiconductor |
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41 / 66 page  MultiMediaCard TM 41 the status register. * Unlocking the card: - Select a card (CMD7), if not previously selected already. - Define the block length (CMD16), given by the 8 bit card lock/unlock mode, the 8 bit password size (in bytes), and the number of bytes of the currently used password. - Send the card lock/unlock command with the appropriate data block size on the data line including 16 bit CRC. The data block shall indicate the mode UNLOCK, the length (PWD_LEN) and the password (PWD) itself. If the PWD content equals to the sent password then the card will be unlocked and the card-locked status bit will be cleared in the status register. If the password is not correct then the LOCK_UNLOCK_FAILED error bit will be set in the status register. Note that the unlocking is done only for the current power session. As long as the PWD is not cleared the card will be locked automatically on the next power up. The only way to unlock the card is by clearing the password. An attempt to unlock an unlocked card will fail and LOCK_UNLOCK_FAILED error bit will be set in the status register. * Forcing Erase: In case that the user forgot the password (the PWD content) it is possible to erase all the card data content along with the PWD content. This operation is called Forced Erase. - Select a card (CMD7), if not previously selected already. - Define the block length (CMD16) to 1 byte (8bit card lock/unlock command). Send the card lock/unlock command with the appropriate data block of one byte on the data line including 16 bit CRC. The data block shall indicate the mode ERASE (the ERASE bit shall be the only bit set). If the ERASE bit is not the only bit in the data field then the LOCK_UNLOCK_FAILED error bit will be set in the status register and the erase request is rejected. If the command was accepted then ALL THE CARD CONTENT WILL BE ERASED including the PWD and PWD_LEN register content and the locked card will get unlocked. An attempt to force erase on an unlocked card will fail and LOCK_UNLOCK_FAILED error bit will be set in the status register. * State transition summary Table “Card State Transition Table” defines the card state transitions as a function of received command 4.9.6 Responses All responses are sent via command line (CMD), all data starts with the MSB. Table 4-10 Format R1(Response Command) 0 0 bit5 … bit0 Bit31 … bit0 Bit6 … bit0 1 start bit card command status CRC end bit The contents of the status field are described in Chapter “Status Format R1b (response command with busy signal): |
类似零件编号 - MC28U512HCFA-0QC00 |
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类似说明 - MC28U512HCFA-0QC00 |
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