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AM42DL640AG Datasheet(PDF) 19 Page - Advanced Micro Devices |
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AM42DL640AG Datasheet(HTML) 19 Page - Advanced Micro Devices |
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19 / 62 page  18 Am42DL640AG October 22, 2002 PR E L I M I N A R Y Sector/Sector Block Protection and Unprotection (Note: For the following discussion, the term “sector” applies to both sectors and sector blocks. A sector block consists of two or more adjacent sectors that are protected or unprotected at the same time (see Table 6). The hardware sector protection feature disables both program and erase operations in any sector. The hard- ware sector unprotection feature re-enables both pro- gram and erase operations in previously protected sectors. Sector protection/unprotection can be imple- mented via two methods. Table 6. Am29DL640G Boot Sector/Sector Block Addresses for Protection/Unprotection Sector protection and 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 27 shows the timing diagram. This method uses standard microprocessor bus cycle timing. For sector unprotect, all unprotected sectors must first be protected prior to the first sector unprotect write cycle. Note that the sector unprotect algorithm unprotects all sectors in parallel. All previ- ously protected sectors must be individually re-pro- tected. To change data in protected sectors efficiently, the temporary sector unprotect function is available. See “Temporary Sector Unprotect”. The device is shipped with all sectors unprotected. AMD offers the option of programming and protecting sectors at its factory prior to shipping the device through AMD’s ExpressFlash™ Service. Contact an AMD representative for details. It is possible to determine whether a sector is pro- tected or unprotected. See the Sector/Sector Block Protection and Unprotection section for details. Write Protect (WP#) The Write Protect function provides a hardware method of protecting without using V ID. This function is one of two provided by the WP#/ACC pin. If the system asserts V IL on the WP#/ACC pin, the de- vice disables program and erase functions in sectors 0, 1, 140, and 141, independently of whether those sectors were protected or unprotected using the Sector A21–A12 Sector/ Sector Block Size SA0 0000000000 8 Kbytes SA1 0000000001 8 Kbytes SA2 0000000010 8 Kbytes SA3 0000000011 8 Kbytes SA4 0000000100 8 Kbytes SA5 0000000101 8 Kbytes SA6 0000000110 8 Kbytes SA7 0000000111 8 Kbytes SA8–SA10 0000001XXX, 0000010XXX, 0000011XXX, 192 (3x64) Kbytes SA11–SA14 00001XXXXX 256 (4x64) Kbytes SA15–SA18 00010XXXXX 256 (4x64) Kbytes SA19–SA22 00011XXXXX 256 (4x64) Kbytes SA23–SA26 00100XXXXX 256 (4x64) Kbytes SA27-SA30 00101XXXXX 256 (4x64) Kbytes SA31-SA34 00110XXXXX 256 (4x64) Kbytes SA35-SA38 00111XXXXX 256 (4x64) Kbytes SA39-SA42 01000XXXXX 256 (4x64) Kbytes SA43-SA46 01001XXXXX 256 (4x64) Kbytes SA47-SA50 01010XXXXX 256 (4x64) Kbytes SA51-SA54 01011XXXXX 256 (4x64) Kbytes SA55–SA58 01100XXXXX 256 (4x64) Kbytes SA59–SA62 01101XXXXX 256 (4x64) Kbytes SA63–SA66 01110XXXXX 256 (4x64) Kbytes SA67–SA70 01111XXXXX 256 (4x64) Kbytes SA71–SA74 10000XXXXX 256 (4x64) Kbytes SA75–SA78 10001XXXXX 256 (4x64) Kbytes SA79–SA82 10010XXXXX 256 (4x64) Kbytes SA83–SA86 10011XXXXX 256 (4x64) Kbytes SA87–SA90 10100XXXXX 256 (4x64) Kbytes SA91–SA94 10101XXXXX 256 (4x64) Kbytes SA95–SA98 10110XXXXX 256 (4x64) Kbytes SA99–SA102 10111XXXXX 256 (4x64) Kbytes SA103–SA106 11000XXXXX 256 (4x64) Kbytes SA107–SA110 11001XXXXX 256 (4x64) Kbytes SA111–SA114 11010XXXXX 256 (4x64) Kbytes SA115–SA118 11011XXXXX 256 (4x64) Kbytes SA119–SA122 11100XXXXX 256 (4x64) Kbytes SA123–SA126 11101XXXXX 256 (4x64) Kbytes SA127–SA130 11110XXXXX 256 (4x64) Kbytes SA131–SA133 1111100XXX, 1111101XXX, 1111110XXX 192 (3x64) Kbytes SA134 1111111000 8 Kbytes SA135 1111111001 8 Kbytes SA136 1111111010 8 Kbytes SA137 1111111011 8 Kbytes SA138 1111111100 8 Kbytes SA139 1111111101 8 Kbytes SA140 1111111101 8 Kbytes SA141 1111111111 8 Kbytes Sector A21–A12 Sector/ Sector Block Size |
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