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參數(shù)資料
| 型號： | PUMA67E4001A-15E |
| 元件分類： | PROM |
| 英文描述： | 128K X 32 EEPROM 5V MODULE, 150 ns, CQMA68 |
| 封裝： | CERAMIC, LCC-68 |
| 文件頁數(shù)： | 2/15頁 |
| 文件大小： | 235K |
| 代理商： | PUMA67E4001A-15E |
ISSUE 4.3 : January 2001
PUMA 2/67E4001/A /B- 12/15/20
10
Notes:
(1) Data Format I/O7-I/O0 (Hex);
Once initiated, this sequence of write operations should not be interrupted.
(2) Enable Write Protect state will be initiated at end of write even if no other data is loaded.
(3) Disable Write Protect state will be initiated at end of write period even if no other data is loaded.
(4) 1 to 128 bytes of data may be loaded.
Software Algorithms
Selecting the software data protection mode requires the host system to precede datawrite operations by a series
of three write operations to three specfic addresses. The three byte sequence opens the page write window
enabling the host to write from from 1 to 128 bytes of data. Once the page load cycle has been completed, the device
will automatically be returned to the data protected state
Software Data Protection Algorithm
Regardless of wheather the device has been protected or not, once the software data protected aglorithm is used
and the data is written, the device will automatically disable further writes unless another command is issued to
cancel it. If no further commands are issued the device will be write protected during power-down and any
subsequent power-up.
LOAD DATA A0
TO
ADDRESS 5555
LOAD DATA 55
TO
ADDRESS 2AAA
LOAD DATA AA
TO
ADDRESS 5555
LAST BYTE / WORD
TO
LAST ADDRESS
LOAD DATA XX
TO
ANY ADDRESS (4)
WRITES
ENABLED (2)
ENTER DATA
PROTECT
STATE
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