NAND08GAH0A NUMONYX [Numonyx B.V], NAND08GAH0A Datasheet - Page 40

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

High speed MultiMediaCard operation
5.5.3
Note:
5.5.4
Note:
40/116
Locking the device
The following steps are required to lock the device:
1.
2.
3.
If the password was previously set (PWD_LEN is not ‘0’), the device is automatically locked
after power-up.
An attempt to lock a locked device or to lock a device that does with no password defined
will fail and the LOCK_UNLOCK_FAILED error bit will be set in the Status Register.
It is possible to set the password and to lock the device in the same sequence. In this case
the host must go through all the steps required to set the password (see
Setting the
Unlocking the device
The following steps are required to lock the device:
1.
2.
An attempt to unlock an unlocked device will fail and LOCK_UNLOCK_FAILED error bit will
be set in the Status Register.
The device is unlocked for the current power session only. As long as the PWD is not
cleared, the device will be automatically locked after the next power-up. The only way to
unlock the device is to clear the 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 indicate the Lock mode, the
length (PWD_LEN) and the password (PWD) itself. If the PWD content is identical to
the device password, the device is locked and the locked status bit set in the Status
Register. If the password is not correct, the LOCK_UNLOCK_FAILED error bit is set in
the Status Register.
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 indicates the Unlock mode, the length
(PWD_LEN) and the password (PWD) itself. If the PWD content is identical to the
device password, the device is unlocked and the locked status bit is cleared in the
Status Register. If the password is incorrect, the LOCK_UNLOCK_FAILED error bit is
set in the Status Register.
password) and set the Lock bit while the new password command is issued.
NAND08GAH0A, NAND16GAH0D
Section 5.5.1: