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X28HC256FI-15 Datasheet(PDF) 7 Page - Xicor Inc. |
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X28HC256FI-15 Datasheet(HTML) 7 Page - Xicor Inc. |
7 / 24 page X28HC256 7 SOFTWARE DATA PROTECTION Figure 6. Timing Sequence—Byte or Page Write CE WE (VCC) WRITE PROTECTED VCC 0V DATA ADDRESS AA 5555 55 2AAA A0 5555 ≤t BLC MAX WRITES OK BYTE OR PAGE tWC ≤t BLC MAX 3859 FHD F16 Figure 7. Write Sequence for Software Data Protection Regardless of whether the device has previously been protected or not, once the software data protection algorithm is used and data has been written, the X28HC256 will automatically disable further writes un- less another command is issued to cancel it. If no further commands are issued the X28HC256 will be write protected during power-down and after any subsequent power-up. Note: Once initiated, the sequence of write operations should not be interrupted. WRITE LAST BYTE TO LAST ADDRESS WRITE DATA 55 TO ADDRESS 2AAA WRITE DATA A0 TO ADDRESS 5555 WRITE DATA XX TO ANY ADDRESS AFTER tWC RE-ENTERS DATA PROTECTED STATE WRITE DATA AA TO ADDRESS 5555 BYTE/PAGE LOAD ENABLED OPTIONAL BYTE OR PAGE WRITE ALLOWED 3859 FHD F06 |
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