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AM29LV6402M Datasheet(PDF) 18 Page - SPANSION |
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AM29LV6402M Datasheet(HTML) 18 Page - SPANSION |
18 / 57 page 16 Am29LV6402M January 23, 2006 Sector Group Protection and Unprotection The hardware sector group protection feature disables both program and erase operations in any sector group. In this device, a sector group consists of four adjacent sectors that are protected or unprotected at the same time (see Table 4). The hardware sector group unprotection feature re-enables both program and erase operations in previously protected sector groups. Sector group protection/unprotection can be implemented via two methods. Sector protection/unprotection requires V ID on the RE- SET# pin only, and can be implemented either in-sys- tem or via programming equipment. Figure 2 shows the algorithms and Figure 24 shows the timing dia- gram. This method uses standard microprocessor bus cycle timing. For sector group unprotect, all unpro- tected sector groups must first be protected prior to the first sector group unprotect write cycle. The device is shipped with all sector groups unpro- tected. AMD offers the option of programming and pro- tecting sector groups at its factory prior to shipping the device through AMD’s ExpressFlash™ Service. Con- tact an AMD representative for details. It is possible to determine whether a sector group is protected or unprotected. See the Autoselect Mode section for details. Table 4. Sector Group Protection/Unprotection Address Table Sector Group A21–A15 SA0 0000000 SA1 0000001 SA2 0000010 SA3 0000011 SA4–SA7 00001xx SA8–SA11 00010xx SA12–SA15 00011xx SA16–SA19 00100xx SA20–SA23 00101xx SA24–SA27 00110xx SA28–SA31 00111xx SA32–SA35 01000xx SA36–SA39 01001xx SA40–SA43 01010xx SA44–SA47 01011xx SA48–SA51 01100xx SA52–SA55 01101xx SA56–SA59 01110xx SA60–SA63 01111xx SA64–SA67 10000xx SA68–SA71 10001xx SA72–SA75 10010xx SA76–SA79 10011xx SA80–SA83 10100xx SA84–SA87 10101xx SA88–SA91 10110xx SA92–SA95 10111xx SA96–SA99 11000xx SA100–SA103 11001xx SA104–SA107 11010xx SA108–SA111 11011xx SA112–SA115 11100xx SA116–SA119 11101xx SA120–SA123 11110xx SA124 1111100 SA125 1111101 SA126 1111110 SA127 1111111 |
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