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AM29LV640MB100RWHF Datasheet(PDF) 23 Page - Advanced Micro Devices |
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AM29LV640MB100RWHF Datasheet(HTML) 23 Page - Advanced Micro Devices |
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23 / 66 page  February 1, 2007 26190C8 Am29LV640MT/B 21 D A TA SH EET Write Protect (WP#) The Write Protect function provides a hardware method of protecting the top two or bottom two sectors without using V ID. WP# is one of two functions pro- vided by the WP#/ACC input. If the system asserts V IL on the WP#/ACC pin, the de- vice disables program and erase functions in the first or last sector independently of whether those sectors were protected or unprotected using the method de- scribed in Sector Group Protection and Unprotection. Note that if WP#/ACC is at V IL when the device is in the standby mode, the maximum input load current is increased. See the table in DC Characteristics. If the system asserts V IH on the WP#/ACC pin, the de- vice reverts to whether the top or bottom two sectors were previously set to be protected or unprotected using the method described in Sector Group Protec- tion and Unprotection. Note: No external pullup is nec- essary since the WP#/ACC pin has internal pullup to V CC Temporary Sector Group Unprotect (Note: In this device, a sector group consists of four adjacent sectors that are protected or unprotected at the same time (see Table 6). This feature allows temporary unprotection of previ- ously protected sector groups to change data in-sys- tem. The Sector Group Unprotect mode is activated by setting the RESET# pin to V ID. During this mode, for- merly protected sector groups can be programmed or erased by selecting the sector group addresses. Once V ID is removed from the RESET# pin, all the previously protected sector groups are protected again. Figure 1 shows the algorithm, and Figure 23 shows the timing diagrams, for this feature. Figure 1. Temporary Sector Group Unprotect Operation 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–SA134 11111XXXXX 256 (4x64) Kbytes Table 6. Am29LV640MB Bottom Boot Sector Protection (Continued) Sector A21–A12 Sector/ Sector Block Size START Perform Erase or Program Operations RESET# = VIH Temporary Sector Group Unprotect Completed (Note 2) RESET# = VID (Note 1) Notes: 1. All protected sector groups unprotected (If WP# = VIL, the first or last sector remain protected). 2. All previously protected sector groups are protected once again. |
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