參數(shù)資料
型號(hào)： GE28F128W30T90
英文描述： EEPROM|FLASH|8MX16|CMOS|BGA|60PIN|PLASTIC
中文描述： 的EEPROM | FLASH動(dòng)畫(huà)| 8M × 16位|的CMOS | BGA封裝| 60PIN |塑料
文件頁(yè)數(shù)： 39/91頁(yè)
文件大?。?/td> 994K
代理商： GE28F128W30T90
1.8 Volt Intel
Wireless Flash Memory with 3 Volt I/O
Datasheet
39
7.1.7
WP# Lock-Down Control
The Write Protect signal, WP#, adds an additional layer of block security. WP# only affects blocks
that once had the Lock-Down command written to them. After the lock-down status bit is set for a
block, asserting WP# forces that block into the lock-down state [011] and prevents it from being
unlocked. After WP# is deasserted, the block’s state reverts to locked [111] and software
commands can then unlock the block (for erase or program operations) and subsequently re-lock it.
Only device reset or power-down can clear the lock-down status bit and render WP# ineffective.
7.2
Protection Register
The 1.8 Volt Intel Wireless Flash memory includes a 128-bit protection register. This protection
register is used to increase system security and for identification purposes. The protection register
value can match the flash component to the system’s CPU or ASIC to prevent device substitution.
The lower 64 bits within the protection register are programmed by Intel with a unique number in
each flash device. The upper 64 OTP bits within the protection register are left for the customer to
program. Once programmed, the customer segment can be locked to prevent further programming.
Note:
The individual bits of the user segment of the protection register are OTP, not the register in total.
The user may program each OTP bit individually, one at a time, if desired. After the protection
Figure 11. Locking Operations Flowchart
No
O
Start
Write 60h
Block Address
Write 90h
BBA + 02h
Read Block Lock
Status
Locking
Change
Lock Change
Complete
Write 01,D0,2Fh
Block Address
Write FFh
Partition Address
Yes
Write
Write
Write
(Optional)
Read
(Optional)
Standby
(Optional)
Write
Lock
Setup
Lock,
Unlock, or
Lockdown
Confirm
Read ID
Plane
Block Lock
Status
Read
Array
Data = 60h
Addr = Block to lock/unlock/lock-down (BA)
Data = 01h (Lock block)
D0h (Unlock block)
2Fh (Lockdown block)
Addr = Block to lock/unlock/lock-down (BA)
Data = 90h
Addr = BBA + 02h
Block Lock status data
Addr = BBA + 02h
Confirm locking change on DQ[1:0].
(See Block Locking State Transitions Table
for valid combinations.)
Data = FFh
Addr = Any address in same partition
OpBus
Comments
LOCKING OPERATIONS PROCEDURE
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