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X28C010FMB-12 Datasheet(PDF) 7 Page - Intersil Corporation |
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X28C010FMB-12 Datasheet(HTML) 7 Page - Intersil Corporation |
7 / 20 page 7 FN8105.1 February 12, 2007 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 X28C010/X28HT010 will automatically disable further writes unless another command is issued to cancel it. If no further commands are issued the X28C010/X28HT010 will be write protected during power-down and after any subsequent power-up. The state of A15 and A16 while executing the algorithm is don’t care. Note: Once initiated, the sequence of write operations should not be interrupted. CE WE (VCC) Write Protected VCC 0V Data Addr AA 5555 55 2AAA A0 5555 ≤ tBLC MAX Writes Ok Byte or Page tWC FIGURE 6. TIMING SEQUENCE—BYTE OR PAGE WRITE Write Last Byte 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 Operation Optional FIGURE 7. WRITE SEQUENCE FOR SOFTWARE DATA PROTECTION X28C010, X28HT010 |
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