NAND08GAH0A NUMONYX [Numonyx B.V], NAND08GAH0A Datasheet - Page 37

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

NAND08GAH0A, NAND16GAH0D
5.4
5.5
Write protection
The device supports two levels of write protection commands to protect data against erase
or write operations:
●
●
The SEND_WRITE_PROT (CMD30) command is similar to a single block read command.
The device sends 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 device will ignore all
LSBs below the group size.
If the host provides an out of range address as an argument to CMD28, CMD29 or CMD30,
the device rejects the command, returns the ADDRESS_OUT_OF_RANGE error and
remains in the Transfer state.
Device locking/unlocking (password protection)
The password protection feature enables the host to lock the device by providing a
password, which later will be used for unlocking the device. The password and its size is
kept in an 128-bit PWD and 8-bit PWD_LEN registers, respectively. These registers are
non-volatile so that a power-up cycle will not erase them.
The host is allowed to reset, initialize, select, query for status, etc., but not to access data on
the device. If the password has been previously set (PWD_LEN value is not ‘0’), the device
is automatically locked after power-up.
A locked device answers and executes all commands belonging to the basic class (class 0)
and to the Lock Card class (class 7). The host can consequently reset, initialize, select,
query for status, etc., but cannot access the data stored in the device.
As for the CSD and CID register write commands, the Lock/Unlock commands are available
in Transfer state only. This means that they do not require any address argument and that
the device has to be selected before issuing any of these commands.
The device Lock/Unlock commands have the same structure and comply with the same
command/response transaction as single block write commands. The transferred data block
The entire memory array may be write protected by setting the permanent or temporary
write protect bits of the CSD register.
Specific segments of the memory may be write protected. The segment size is defined
in units of WP_GRP_SIZE erase groups as specified in the CSD register. The
SET_WRITE_PROT (CMD28) command sets the write protection of the addressed
write-protect group, and the CLR_WRITE_PROT (CMD29) command clears the write
protection of the addressed write-protect group.
High speed MultiMediaCard operation
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