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S29GL032A90FAIR42 데이터시트(PDF) 36 Page - SPANSION |
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36 / 88 page 34 S29GLxxxA MirrorBit™ Flash Family S29GLxxxA_00_A2 January 28, 2005 Ad van c e Inf o rmation Temporary Sector Group Unprotect This feature allows temporary unprotection of previously protected sector groups to change data in-system. The Sector Group Unprotect mode is activated by set- ting the RESET# pin to VID. During this mode, formerly protected sector groups can be programmed or erased by selecting the sector group addresses. Once VID is removed from the RESET# pin, all the previously protected sector groups are protected again. Figure 1 shows the algorithm, and Figure 22 shows the timing diagrams, for this feature. Notes: 1. All protected sector groups unprotected (If WP# = VIL, the highest or lowest address sector will remain protected for uniform sector devices; the top or bottom two address sectors will remain protected for boot sector devices). 2. All previously protected sector groups are protected once again. Figure 1. Temporary Sector Group Unprotect Operation START Perform Erase or Program Operations RESET# = VIH Temporary Sector Group Unprotect Completed (Note 2) RESET# = VID (Note 1) |
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