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X28C256EI-35 Datasheet(PDF) 8 Page - Xicor Inc. |
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X28C256EI-35 Datasheet(HTML) 8 Page - Xicor Inc. |
8 / 24 page 8 X28C256 RESETTING SOFTWARE DATA PROTECTION Figure 8. Reset Software Data Protection Timing Sequence 3855 FHD F18 Figure 9. Software Sequence to Deactivate Software Data Protection WRITE DATA 55 TO ADDRESS 2AAA WRITE DATA 55 TO ADDRESS 2AAA WRITE DATA 80 TO ADDRESS 5555 WRITE DATA AA TO ADDRESS 5555 WRITE DATA 20 TO ADDRESS 5555 WRITE DATA AA TO ADDRESS 5555 3855 FHD F19 In the event the user wants to deactivate the software data protection feature for testing or reprogramming in an E2PROM programmer, the following six step algo- rithm will reset the internal protection circuit. After tWC, the X28C256 will be in standard operating mode. Note: Once initiated, the sequence of write operations should not be interrupted. CE WE STANDARD OPERATING MODE VCC DATA ADDR. AA 5555 55 2AAA 80 5555 ≥t WC AA 5555 55 2AAA 20 5555 |
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