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MC1DU064HBYA-0QC00 Arkusz danych(PDF) 38 Page - Samsung semiconductor |
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MC1DU064HBYA-0QC00 Arkusz danych(HTML) 38 Page - Samsung semiconductor |
38 / 66 page MultiMediaCard TM 38 ERASE_GROUP_END(CMD36) command and finally it starts the erase process by issuing the ERASE(CMD38) command. The address field in the erase commands is an Erase Group address in byte units. The card will all LSB’s below the Erase Group size, effectively rounding the address down to the Erase Group boundary. If an erase command is received out of sequence, the card shall set the ERASE_SEQ_ERROR bit in the status register and reset the whole sequence. If an out of sequence(neither of the erase commands, except SEND_STATUS) command received, the card shall set the ERASE_RESET status bit in the status register, reset the erase sequence and execute the last command. If the erase range includes write protected blocks, the shall be left intact and only the non-protected blocks shall be erased. The WP_ERASE_SKIP status bit in the status register shall be set. As described above for block write, the card will indicate that an erase is in progress by holding DAT low The actual erase time may be quite long, and the host may issue CMD7 to deselect the card. 4.9.4 Write Protect Management Card data may be protected against either erase or write. The entire card may be permanently write protected by the manufacturer or content provider by setting the permanent or temporary write protect bits in the CSD. Portions of the data may be protected (in units of WP_GRP_SIZE sectors as specified in the CSD), and the write protection may be changed by the application. The SET_WRITE_PROT command sets the write protection of the addressed write-protect group, and the CLR_WRITE_PROT command clears the write protection of the addressed write-protect group. The SEND_WRITE_PROT command is similar to a single block read command. The card shall send a data block containing 32 write protection bits (representing 32 write protect groups starting at the specified address) followed by 16 CRC bits. The address field in the write protect commands is a group address in byte units. The card will ignore all LSB’s below the group size. 4.9.5 Card Lock/Unlock Operation The password protection feature enables the host to lock a card while providing a password, which later will be used for unlocking the card. The password and its size are kept in a 128-bit PWD and 8-bit PWD_LEN registers, respectively. These registers are non-volatile so that a power cycle will not erase them. Locked cards respond to (and execute) all commands in the "basic" command class (class 0) and “lock card” command class. Thus the host is allowed to reset, initialize, select, query for status, etc., but not to access data on the card. If the password was previously set (the value of PWD_LEN is not‘0’) will be locked automatically after power on. Similar to the existing CSD and CID register write commands the lock/unlock command is available in "transfer state" only. This means that it does not include an address argument and the card has to be selected before using it. The card lock/unlock command has the structure and bus transaction type of a regular single block write command. The transferred data block includes all the required information of the command (password setting mode, PWD itself, card lock/unlock etc.). The following table describes the structure of the command data block. Table 4-9 Card Lock Data Structure Byte# Bit7 Bit6 Bit5 Bit4 Bit3 Bit2 Bit1 Bit0 0 Reserved ERASE LOCK_ UNLOCK CLR_ PWD SET_ PWD 1 PWD_LEN 2 … PWD_LEN+1 Password data |
Podobny numer części - MC1DU064HBYA-0QC00 |
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Podobny opis - MC1DU064HBYA-0QC00 |
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