參數(shù)資料
型號(hào)： HB28B128MM2
廠商： Hitachi,Ltd.
英文描述： MultiMediaCard 16 Mbyte/32 Mbyte/64 Mbyte/128 MByte
中文描述： 多媒體16 Mbyte/32 Mbyte/64 Mbyte/128字節(jié)
文件頁(yè)數(shù)： 39/88頁(yè)
文件大?。?/td> 329K
代理商： HB28B128MM2
HB28E016/D032/D064/B128MM2
39
ERASE: 1 Defines Forced Erase Operation (all other bits shall be ‘0’) and only the cmd byte is
sent.
LOCK/UNLOCK: 1 = Locks the card. 0 = Unlock the card (note that it is valid to set this bit
together with SET_PWD but it is not allowed to set it together with CLR_PWD).
CLR_PWD: 1 = Clears PWD.
SET_PWD: 1 = Set new password to PWD
PWD_LEN: Defines the following password length (in bytes).
PWD: The password (new or currently used depending on the command).
The data block size shall be defined by the host before it sends the card lock/unlock command. This will
allow different password sizes. The following paragraphs define the various lock/unlock command
sequences:
Setting the Password
—
Select a card (CMD7), if not previously selected already
—Define the block length (CMD16), given by the 8bit card lock/unlock mode, the 8-bit password
size (in bytes), and the number of bytes of the new password. In case that a password replacement
is done, then the block size shall consider that both passwords, the old and the new one, are sent
with the command.
—Send 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 (SET_PWD), the length
(PWD_LEN) and the password itself. In case that a password replacement is done, then the length
value (PWD_LEN) shall include both passwords, the old and the new one, and the PWD field
shall include the old password (currently used) followed by the new password.
—In case that the sent old password is not correct (not equal in size and content) then
LOCK_UNLOCK_FAILED error bit will be set in the status register and the old password
does not change. In case that PWD matches the sent old password then the given new password
and its size will be saved in the PWD and PWD_LEN fields, respectively.
Note that the password length register (PWD_LEN) indicates if a password is currently set. When it equals
‘0’ there is no password set. If the value of PWD_LEN is not equal to zero the card will lock itself after
power up. It is possible to lock the card immediately in the current power session by set-ting the
LOCK/UNLOCK bit (while setting the password) or sending additional command for card lock.
Reset the Password:
—
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 CLR_PWD, the length
(PWD_LEN) and the password (PWD) itself (LOCK/UNLOCK bit is don’t care). If the PWD
and PWD_LEN content match the sent password and its size, then the content of the PWD
相關(guān)PDF資料
PDF描述
HB28D032MM2 MultiMediaCard 16 Mbyte/32 Mbyte/64 Mbyte/128 MByte
HB28D064MM2 MultiMediaCard 16 Mbyte/32 Mbyte/64 Mbyte/128 MByte
HB28E016MM2 MultiMediaCard 16 Mbyte/32 Mbyte/64 Mbyte/128 MByte
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HB28C048C6 CompactFlash⑩
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