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AM29LV641MH 데이터시트(PDF) 18 Page - Advanced Micro Devices |
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AM29LV641MH 데이터시트(HTML) 18 Page - Advanced Micro Devices |
18 / 60 page 16 Am29LV641MH/L December 21, 2005 DA TA SH EET Write Protect (WP#) The Write Protect function provides a hardware method of protecting the first or last sector without using V ID. If the system asserts V IL on the WP# pin, the device disables program and erase functions in the first or last sector independently of whether those sectors were protected or unprotected using the method described in “Sector Group Protection and Unprotection”. Note that if WP# 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# pin, the device reverts to whether the first or last sector was previ- ously set to be protected or unprotected using the method described in “Sector Group Protection and Unprotection”. 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 4). 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 24 shows the timing diagrams, for this feature. Figure 1. Temporary Sector Group Unprotect Operation START Perform Erase or Program Operations RESET# = V IH Temporary Sector Group Unprotect Completed (Note 2) RESET# = V ID (Note 1) Notes: 1. All protected sector groups unprotected (If WP# = V IL, the first or last sector will remain protected). 2. All previously protected sector groups are protected once again. |
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