MD3331-D64-V3-X SanDisk, MD3331-D64-V3-X Datasheet - Page 23

• Manufacturer Part Number: MD3331-D64-V3-X
• Manufacturer: SanDisk
• Type: Flash Diskr

Specifications of MD3331-D64-V3-X

• Density: 64MByte
• Operating Supply Voltage (typ): 3.3V
• Operating Temperature (min): -40C
• Operating Temperature (max): 85C
• Package Type: FBGA
• Mounting: Surface Mount
• Pin Count: 69
• Operating Temperature Classification: Industrial
• Operating Supply Voltage (min): 2.5V
• Operating Supply Voltage (max): 3.6V
• Programmable: Yes
• Lead Free Status / Rohs Status: Not Compliant

4.
4.1
Mobile DiskOnChip Plus enables the user to define two partitions that are protected (in hardware)
against any combination of read or write operations. The two protected areas can be configured as
read protected or write-protected, and are protected by a protection key (i.e. password) defined by
the user. Each of the protected areas can be configured separately and can function separately,
providing maximal flexibility for the user.
The size and protection attributes (protection key/read/write/changeable/lock) of the protected
partition are defined in the media formatting stage (DFORMAT utility or the format function in the
TrueFFS SDK).
In order to set or remove a read/write protection, the protection key (i.e., password) must be used, as
follows:
•
•
Mobile DiskOnChip Plus has an additional hardware safety measurement. If the Lock option is
enabled (by means of software) and the LOCK# ball is asserted, the protected partition has an
additional hardware lock that prevents read/write access to the partition, even with the use of the
correct protection key. The LOCK# ball must be asserted during DFORMAT (and later when the
partition is defined as changeable) to enable the additional hard-wired safety lock.
It is possible to set the Lock option for one session only, that is, until the next power-up or reset.
This Sticky Lock feature can be useful when the boot code in the boot partition must be read/write
protected. Upon power-up, the boot code must be unprotected so the CPU can run it directly from
Mobile DiskOnChip Plus. At the end of the boot process, protection can be set until the next power-
up or reset.
Setting the Sticky Lock (SLOCK) bit in the Output Control register to 1 has the same effect as
asserting the LOCK# ball. Once set, SLOCK can only be cleared by asserting the RSTIN# input.
Like the LOCK# input, the assertion of this bit prevents the protection key from disabling the
protection for a given partition. For more information, see Section 7.9. The target partition does not
have to be mounted before calling a hardware protection routine.
Only one partition can be defined as “changeable”; i.e., its password and attributes are fully
configurable at any time (from read to write, both or none and visa versa). Note that “un-
changeable” partition attributes cannot be changed unless the media is reformatted.
A change of any of the protection attributes causes a reset of the protection mechanism and
consequently the removal of all device protection keys. That is, if the protection attributes of one
partition are changed, the other partition will lose its key-protected read/write protection.
The only way to read or write from a read or write protected partition is to use the insert key call
(even DFORMAT does not remove the protection). This is also true for modifying its attributes
23
Insert the protection key to remove read/write protection.
Remove the protection key to set read/write protection.
H
Method of Operation
ARDWARE
P
ROTECTION
Data Sheet, Rev. 1.8
Mobile DiskOnChip Plus 16/32MByte
95-SR-000-10-8L