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參數資料
| 型號： | W28V400B |
| 廠商： | WINBOND ELECTRONICS CORP |
| 英文描述： | 4M(512K x 8/256K x 16) SMARTVOLTAGE FLASH MEMORY |
| 中文描述： | 4分（為512k × 8/256K × 16）SMARTVOLTA通用閃存 |
| 文件頁數： | 44/48頁 |
| 文件大小： | 1822K |
| 代理商： | W28V400B |
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W28V400B/T
- 44 -
12. FLASH MEMORY W28V400 FAMILY DATA PROTECTION
Noises having a level exceeding the limit specified in this document may be generated under specific
operating conditions on some systems.
Such noises, when induced onto #WE signal or power supply, may be interpreted as false commands,
and which will cause undesired memory updating.
To protect the data stored in the flash memory against unwanted overwriting, systems operating with
the flash memory should have the following write protect designs, as appropriate:
1. Protecting data in specific block
By setting a #WP to low, only the boot block can be protected against overwriting.
Parameter and main blocks cannot be locked.
System program, etc., can be locked by storing them in the boot block.
When a high voltage is applied to #RESET, overwrite operation is enabled for all blocks.
2. Data protection through V
PP
When the level of V
PP
is lower than V
PPLK
(lockout voltage), write operation on the flash
memory is disabled. All blocks are locked and the data in the blocks are completely write
protected.
3. Data protection through #RESET
When the #RESET is kept low during power up and power down sequence such as voltage
transition, write operation on the flash memory is disabled, write protecting all blocks.
4. Noise rejection of #WE
Consider noise rejection of #WE in order to prevent false write command input.
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相關代理商/技術參數 |
參數描述 |
|---|---|
| W28V400BT85C | 制造商:WINBOND 制造商全稱:Winbond 功能描述:4M(512K x 8/256K x 16) SMARTVOLTAGE FLASH MEMORY |
| W28V400T | 制造商:WINBOND 制造商全稱:Winbond 功能描述:4M(512K x 8/256K x 16) SMARTVOLTAGE FLASH MEMORY |
| W28V400TT85C | 制造商:WINBOND 制造商全稱:Winbond 功能描述:4M(512K x 8/256K x 16) SMARTVOLTAGE FLASH MEMORY |
| W28WH | 制造商:ETERNA 功能描述:TRACKLIGHT, FLEXIBLE TRACK COUPLER |
| W28-X01B-3 | 制造商:TE Connectivity 功能描述: |
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