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S29AL032D90TFE040 Datasheet(PDF) 26 Page - SPANSION |
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S29AL032D90TFE040 Datasheet(HTML) 26 Page - SPANSION |
26 / 69 page 24 S29AL032D S29AL032D_00_A3 June 13, 2005 Advan ce In form ati o n Temporary Sector Unprotect This feature allows temporary unprotection of previously protected sectors to change data in-sys- tem. The Sector Unprotect mode is activated by setting the RESET# pin to VID. During this mode, formerly protected sectors can be programmed or erased by selecting the sector addresses. Once VID is removed from the RESET# pin, all the previously protected sectors are protected again. shows the algorithm, and Figure 24, on page 58 shows the timing diagrams, for this feature. Figure 1. Temporary Sector Unprotect Operation START Perform Erase or Program Operations RESET# = VIH Temporary Sector Unprotect Completed (Note 2) RESET# = VID (Note 1) Notes: 1. All protected sectors unprotected. 2. All previously protected sectors are protected once again. |
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