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K8P2815UQC 数据表(PDF) 22 Page - Samsung semiconductor

部件名 K8P2815UQC
功能描述  128Mb C-die NOR FLASH
Download  62 Pages
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制造商  SAMSUNG [Samsung semiconductor]
网页  http://www.samsung.com/Products/Semiconductor
标志 SAMSUNG - Samsung semiconductor

K8P2815UQC 数据表(HTML) 22 Page - Samsung semiconductor

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- 22 -
K8P2815UQC
datasheet
FLASH MEMORY
Rev. 1.0
[Table 7] Block Protection Schemes
10.25 Block Protection
The K8P2815UQC features several levels of block protection, which can disable both the program and erase operations in certain blocks or block groups:
Persistent Block Protection
A command block protection method that replaces the old 12 V controlled protection method.
Password Block Protection
A highly sophisticated protection method that requires a password before changes to certain blocks or block groups are permitted
Selecting a Block Protection Mode
All parts default to operate in the Persistent Block Protection mode. The customer must then choose if the Persistent or Password Protection method is
most desirable. There are two one-time programmable non-volatile bits that define which block protectionmethod will be used. If the Persistent Block Pro-
tection method is desired, programming the Persistent Block Protection Mode Locking Bit permanently sets the device to the Persistent Block Protection
mode. If the Password Block Protection method is desired, programming the Password Mode Locking Bit permanently sets the device to the Password
Block Protection mode.
It is not possible to switch between the two protection modes once a locking bit has been set. One of the two modes must be selected when the device is
first programmed. This prevents a program or virus from later setting the Password Mode Locking Bit, which would cause an unexpected shift from the
default Persistent Block Protection Mode into the Password Protection Mode.
The device is shipped with all blocks unprotected. Optional Samsung programming services enable programming and protecting blocks at the factory
prior to shipping the device. Contact your local sales office for details.
It is possible to determine whether a block is protected or unprotected. See Autoselect Mode for details.
Persistent Block Protection
The Persistent Block Protection method replaces the 12 V controlled protection method in previous flash devices. This new method provides three differ-
ent block protection states:
Persistently Locked - The block is protected and cannot be changed.
Dynamically Locked - The block is protected and can be changed by a simple command.
Unlocked - The block is unprotected and can be changed by a simple command.
To achieve these states, three types of "bits" are used:
Persistent Protection Bit
Persistent Protection Bit Lock
Persistent Block Protection Mode Locking Bit
Persistent Protection Bit (PPB)
A single Persistent (non-volatile) Protection Bit is assigned to a maximum four blocks (see the block address tables for specific block protection group-
ings). All 4 Kword boot-block sectors have individual block Persistent Protection Bits(PPBs) for greater flexibility. Each PPB is individually modifiable
through the PPB Write Command.
DYB
PPB
PPB Lock
Block State
0
0
0
Unprotected-PPB and DYB are changeable
0
0
1
Unprotected-PPB not changeable and DYB are changeable
01
0
Protected-PPB and DYB are changeable
10
0
11
0
01
1
Protected-PPB not changeable, DYB is changeable
10
1
11
1


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