MD8331-D2G-V3-X-P SanDisk, MD8331-D2G-V3-X-P Datasheet - Page 30

• Manufacturer Part Number: MD8331-D2G-V3-X-P
• Description: IC MDOC G4 2GB 69-FBGA
• Manufacturer: SanDisk

Specifications of MD8331-D2G-V3-X-P

• Format - Memory: FLASH
• Memory Type: FLASH - Nand
• Memory Size: 2G (256M x 8)
• Speed: 33ns
• Interface: Parallel
• Voltage - Supply: 2.5 V ~ 3.6 V
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 69-FBGA
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 585-1149-2; MD8831-D2G-V3-X-P; MD8832-D2G-V3-X-P

5.
5.1
DiskOnChip G4 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 maximum 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 read/write protection, the protection key (i.e., password) must be used, as
follows:
DiskOnChip G4 has an additional hardware safety measure. 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.
It is possible to set the Lock protection 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
DiskOnChip G4. 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# signal. 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 3.4.5. The target partition does
require mounting before calling a hardware protection routine.
The only way to read or write from a protected partition is to insert the key (even DFORMAT
cannot remove the protection). This is also true for modifying its attributes (protection key, read,
write and lock). Read/write protection is disabled (the key is automatically removed) in each of the
following events:
For further information on hardware protection, please refer to the TrueFFS Software Development
Kit (SDK) developer guide.
30
• Insert the protection key to remove read/write protection.
• Remove the protection key to set read/write protection.
• Power-down
• Change of any protection attribute (not necessarily in the same partition)
• Write operation to the IPL area
• Removal of the protection key.
H
Method of Operation
ARDWARE
P
ROTECTION
Data Sheet (Preliminary) Rev. 0.3
DiskOnChip G4 128MB (1Gb)/256MB (2Gb) 1.8V
92-DS-1105-00