MD4331-d1G-MECH M-Systems Inc., MD4331-d1G-MECH Datasheet - Page 34

• Manufacturer Part Number: MD4331-d1G-MECH
• Description: Mobile Diskonchip G3 Data Sheet
• Manufacturer: M-Systems Inc.

cascaded in multiplexed configuration (dual-die Mobile DiskOnChip G3 1Gb cannot be cascaded
when used in a multiplexed interface).
3.3
The Configuration Interface block enables the designer to configure Mobile DiskOnChip G3 to
operate in different modes. The ID[1:0] signals are used in a cascaded configuration (refer to
Section 10.6), the DPD signal is used to enter and exit Deep Power-Down mode (see Section 6.3),
the LOCK# signal is used for hardware write/read protection, and the IF_CFG signal is used to
configure 8/16-bit access.
3.4
The Protection and Security-Enabling block, consisting of read/write protection, UID and an OTP
area, enables advanced data and code security and content protection. Located on the main route of
traffic between the host and the flash, this block monitors and controls all data and code transactions
to and from Mobile DiskOnChip G3.
3.4.1
Data and code protection is implemented through a Protection State Machine (PSM). The user can
configure one or two independently programmable areas of the flash memory as read protected,
write protected, or read/write protected.
A protected partition may be protected by either/both of these hardware mechanisms:
•
•
If the Lock option is enabled (by means of software) and the LOCK# signal 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# signal must be asserted during
formatting (and later when the partition is defined as changeable) to enable the additional hardware
safety lock.
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 vise versa). Note that “un-
changeable” partition attributes cannot be changed unless the media is reformatted.
The size and protection attributes of the protected partition are defined during the media-formatting
stage.
In the event of an attempt to bypass the protection mechanism, illegally modify the protection key
or in any way sabotage the configuration parameters, the entire Mobile DiskOnChip G3 becomes
both read and write protected, and is completely inaccessible.
For further information on hardware protection, please refer to the TrueFFS Software Development
Kit (SDK) developer guide.
3.4.2
Each Mobile DiskOnChip G3 is assigned a 16-byte UID number. Burned onto the flash during
production, the UID cannot be altered and is unique worldwide. The UID is essential in security-
31
64-bit protection key
Hard-wired LOCK# signal
Configuration Interface
Protection and Security-Enabling Features
Read/Write Protection
Unique Identification (UID) Number
Data Sheet, Rev. 1.0
Mobile DiskOnChip G3
91-SR-011-05-8L