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AM29LV256MH103REF Datasheet(PDF) 26 Page - Advanced Micro Devices |
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AM29LV256MH103REF Datasheet(HTML) 26 Page - Advanced Micro Devices |
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26 / 69 page  24 Am29LV256M December 16, 2005 D A TA SH EE T Sector Group Protection and Unprotection The hardware sector group protection feature disables both program and erase operations in any sector group. The hardware sector group unprotection fea- ture re-enables both program and erase operations in previously protected sector groups. Sector group pro- tection/unprotection can be implemented via two methods. Sector group protection/unprotection requires V ID on the RESET# pin only, and can be implemented either in-system or via programming equipment. Figure 2 shows the algorithms and Figure 23 shows the timing diagram. For sector group unprotect, all unprotected sector groups must first be protected prior to the first sector group unprotect write cycle. Note that the sec- tor group unprotect algorithm unprotects all sector groups in parallel. All previously protected sector groups must be individually re-protected. 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 A23–A15 SA0 000000000 SA1 000000001 SA2 000000010 SA3 000000011 SA4–SA7 0000001xx SA8–SA11 0000010xx SA12–SA15 0000011xx SA16–SA19 0000100xx SA20–SA23 0000101xx SA24–SA27 0000110xx SA28–SA31 0000111xx SA32–SA35 0001000xx SA36–SA39 0001001xx SA40–SA43 0001010xx SA44–SA47 0001011xx SA48–SA51 0001100xx SA52–SA55 0001101xx SA56–SA59 0001110xx SA60–SA63 0001111xx SA64–SA67 0010000xx SA68–SA71 0010001xx SA72–SA75 0010010xx SA76–SA79 0010011xx SA80–SA83 0010100xx SA84–SA87 0010101xx SA88–SA91 0010110xx SA92–SA95 0010111xx SA96–SA99 0011000xx SA100–SA103 0011001xx SA104–SA107 0011010xx SA108–SA111 0011011xx SA112–SA115 0011100xx SA116–SA119 0011101xx SA120–SA123 0011110xx SA124–SA127 0011111xx SA128–SA131 0100000xx SA132–SA135 0100001xx SA136–SA139 0100010xx SA140–SA143 0100011xx SA144–SA147 0100100xx SA148–SA151 0100101xx SA152–SA155 0100110xx SA156–SA159 0100111xx SA160–SA163 0101000xx SA164–SA167 0101001xx SA168–SA171 0101010xx SA172–SA175 0101011xx SA176–SA179 0101100xx SA180–SA183 0101101xx SA184–SA187 0101110xx SA188–SA191 0101111xx SA192–SA195 0110000xx SA196–SA199 0110001xx SA200–SA203 0110010xx SA204–SA207 0110011xx SA208–SA211 0110100xx SA212–SA215 0110101xx SA216–SA219 0110110xx SA220–SA223 0110111xx SA224–SA227 0111000xx SA228–SA231 0111001xx SA232–SA235 0111010xx SA236–SA239 0111011xx SA240–SA243 0111100xx SA244–SA247 0111101xx Sector Group A23–A15 |
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