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參數(shù)資料
| 型號： | WE128K32-300G2TMEA |
| 廠商： | WHITE ELECTRONIC DESIGNS CORP |
| 元件分類： | PROM |
| 英文描述： | 128K X 32 EEPROM 5V MODULE, 300 ns, CQFP68 |
| 封裝： | 22.40 X 22.40 MM, 4.57 MM HEIGHT, HERMETIC SEALED, CERAMIC, LQFP-68 |
| 文件頁數(shù)： | 11/11頁 |
| 文件大?。?/td> | 161K |
| 代理商： | WE128K32-300G2TMEA |
9
White Electronic Designs Corporation Phoenix, AZ (602) 437-1520
WE128K32-XG2TXE
HARDWARE DATA PROTECTION
These features protect against inadvertent writes to the
WE128K32-XG2TXE. These are included to improve reliability
during normal operation:
a) Write inhibiting
Holding OE low and either CS or WE high inhibits write
cycles.
b) Noise filter
Pulses of <20ns (typ) on WE or CS will not initiate a write
cycle.
c) Protection by RESET
SOFTWARE DATA PROTECTION
A software write protection feature may be enabled or disabled
by the user. When shipped by White Microelectronics, the
WE128K32-XG2TXE has the feature disabled. Write access to
the device is unrestricted.
To enable software write protection, the user writes three
access code bytes to three special internal locations. Once
write protection has been enabled, each write to the EEPROM
must use the same three byte write sequence to permit writing.
After setting software data protection, any attempt to write to
the device without the three-byte command sequence will start
the internal write timers. No data will be written to the device,
however, for the duration of tWC. The write protection feature
can be disabled by a six byte write sequence of specific data to
specific locations. Power transitions will not reset the
software write protection.
Each 128K byte block of the EEPROM has independent write
protection. One or more blocks may be enabled and the rest
disabled in any combination. The software write protection
guards against inadvertent writes during power transitions, or
unauthorized modification using a PROM programmer.
FIG. 9
SOFTWARE DATA PROTECTION
DISABLE ALGORITHM(1)
EXIT DATA
PROTECT STATE
NOTES:
1. Data Format: D7 - D0 (Hex);
Address Format: A16 - A0 (Hex).
2. Write Protect state will be activated at end of write even if no other
data is loaded.
3. Write Protect state will be deactivated at end of write period even if
no other data is loaded.
4. 1 to 128 bytes of data may be loaded.
(3)
LOAD DATA AA
TO
ADDRESS 5555
LOAD DATA 55
TO
ADDRESS 2AAA
LOAD DATA 80
TO
ADDRESS 5555
LOAD DATA AA
TO
ADDRESS 5555
LOAD DATA 55
TO
ADDRESS 2AAA
LOAD DATA 20
TO
ADDRESS 5555
LOAD DATA XX
TO
ANY ADDRESS(4)
LOAD LAST BYTE
TO
LAST ADDRESS
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