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| 型号： | SDED7-256M-N9Y |
| 厂商： | SANDISK CORP |
| 元件分类： | 存储控制器/管理单元 |
| 英文描述： | FLASH MEMORY DRIVE CONTROLLER, PBGA115 |
| 封装： | 12 X 9 MM, 1.20 MM HEIGHT, FBGA-115 |
| 文件页数： | 22/87页 |
| 文件大小： | 1675K |
| 代理商： | SDED7-256M-N9Y |
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Rev. 1.2
Data Protection and Security-Enabling features
mDOC H3 EFD Featuring Embedded TrueFFS Data Sheet
29
92-DS-1205-10
4.
DATA PROTECTION AND SECURITY-ENABLING FEATURES
4.1.1
Read/Write-Protected partitions
Data and code protection is implemented on a per-partition basis. The user can configure each
partition as read protected, write protected, or read and write protected.
A protected partition may be protected by either/both of these mechanisms:
Up to 64 bit protection key
Hard-wired LOCK# signal
Sticky lock (SLOCK)
In order to set or remove read/write protection, the protection key must be used as follows:
Insert the protection key to remove read/write protection
Remove the protection key to set read/write protection
The only way to read or write from/to a partition that is protected against read or write, is to
insert the key. This is also true for modifying its attributes (protection key, read, write and lock).
Read/write access is disabled (the key is automatically removed) in each of the following events:
Power-down
Removal of the protection key
For further information on protection, please refer to the DOC Driver 1.0 Block Device (BD)
Software Development Kit (SDK) developer guide.
4.1.2
LOCK# signal
mDOC H3 has an additional hardware safety measure. If the Lock option is enabled for a
specific partition, 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.
4.1.3
Sticky Lock (SLOCK)
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 mDOC H3. At the end of the boot process, protection can be set until the next
power-up or reset. This is done by setting the Sticky Lock (SLOCK) bit in the Software Lock
register, or using a dedicated S/W API, and 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,
assertion of this bit prevents the protection key from disabling the protection for a given
partition. There is no need to mount the partition prior to this operation.
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