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DS42587 데이터시트(PDF) 17 Page - Advanced Micro Devices |
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DS42587 데이터시트(HTML) 17 Page - Advanced Micro Devices |
17 / 58 page DS42587 17 Note that the WP#/ACC pin must not be left floating or unconnected; inconsistent behavior of the device may result. Temporary Sector/Sector Block Unprotect (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 7). This feature allows temporary unprotection of previ- ously protected sectors to change data in-system. The Sector Unprotect mode is activated by setting the RE- SET# pin to V ID (8.5 V – 12.5 V). During this mode, formerly protected sectors can be programmed or erased by selecting the sector addresses. Once V ID is removed from the RESET# pin, all the previously pro- tected sectors are protected again. Figure 1 shows the algorithm, and Figure 25 shows the timing diagrams, for this feature. Figure 1. Temporary Sector Unprotect Operation START Perform Erase or Program Operations RESET# = V IH Temporary Sector Unprotect Completed (Note 2) RESET# = V ID (Note 1) Notes: 1. All protected sectors unprotected (If WP#/ACC = V IL, outermost boot sectors will remain protected). 2. All previously protected sectors are protected once again. |
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