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AM29LV641MH101REI 데이터시트(PDF) 17 Page - Advanced Micro Devices |
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AM29LV641MH101REI 데이터시트(HTML) 17 Page - Advanced Micro Devices |
17 / 60 page December 21, 2005 Am29LV641MH/L 15 DA TA SH EET 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 VID 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 25 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 Note: All sector groups are 128 Kwords in size. Sector Group A21–A17 SA0–SA3 00000 SA4–SA7 00001 SA8–SA11 00010 SA12–SA15 00011 SA16–SA19 00100 SA20–SA23 00101 SA24–SA27 00110 SA28–SA31 00111 SA32–SA35 01000 SA36–SA39 01001 SA40–SA43 01010 SA44–SA47 01011 SA48–SA51 01100 SA52–SA55 01101 SA56–SA59 01110 SA60–SA63 01111 SA64–SA67 10000 SA68–SA71 10001 SA72–SA75 10010 SA76–SA79 10011 SA80–SA83 10100 SA84–SA87 10101 SA88–SA91 10110 SA92–SA95 10111 SA96–SA99 11000 SA100–SA103 11001 SA104–SA107 11010 SA108–SA111 11011 SA112–SA115 11100 SA116–SA119 11101 SA120–SA123 11110 SA124–SA127 11111 |
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