NAND08GAH0A NUMONYX [Numonyx B.V], NAND08GAH0A Datasheet - Page 39

• Manufacturer Part Number: NAND08GAH0A
• Manufacturer: NUMONYX [Numonyx B.V]

NAND08GAH0A, NAND16GAH0D
5.5.1
Note:
5.5.2
Setting the password
The following steps are required to set the password:
1.
2.
3.
If a password replacement is attempted with PWD_LEN set to the length of the current
password only, or the current password is not correct (different size and content), then the
LOCK_UNLOCK_FAILED error bit will be set in the Status Register and the current
password is not changed.
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.
The device can be locked immediately after setting the password by programming the
Lock/Unlock bit to ‘1’ while setting the password or by sending an additional Lock command.
Resetting the password
The following steps are required to reset the password:
1.
2.
3.
Select the device if it has not been not previously selected. This is performed by issuing
a CMD7 command.
Configure the block length by issuing a CMD16 command. The block length is given by
the 8-bit Lock/Unlock mode, the 8-bit password size (in bytes), and the number of bytes
of the new password. In case of password replacement, the block size must take into
account the fact that both the old and the new passwords are sent with the command.
Send a Lock/Unlock command on the data line, along with the data block of the
appropriate size and 16-bit CRC. The data block must contain the mode (SET_PWD),
the length (PWD_LEN) and the password itself. If a password replacement is
performed, the length value (PWD_LEN) must take into account both old and the new
password length, and the PWD field must be composed of the current password
followed by the new password.
Select the device if it has not been not previously selected. This is performed by issuing
a CMD7 command.
Configure the block length by issuing a CMD16 command. The block length is given by
the 8-bit Lock/Unlock mode, the 8-bit password size (in bytes), and the number of bytes
of the current password.
Send the Lock/Unlock command on the data line, along with the data block of the
appropriate size and 16- bit CRC. The data block must contain the mode (CLR_PWD),
the length (PWD_LEN) and the password itself. (PWD). If the PWD and PWD_LEN
content match the password and its size, then the content of the PWD register is
cleared and PWD_LEN is set to 0. If the password is not correct then the
LOCK_UNLOCK_FAILED error bit is set in the Status Register.
High speed MultiMediaCard operation
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