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AM29DL322GT90WMIN Datasheet(PDF) 21 Page - SPANSION |
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AM29DL322GT90WMIN Datasheet(HTML) 21 Page - SPANSION |
21 / 58 page December 4, 2006 25686B10 Am29DL32xG 19 D A TA SH EE T It is possible to determine whether a sector is pro- tected or unprotected. See the Autoselect Mode sec- tion for details. Write Protect (WP#) The Write Protect function provides a hardware method of protecting certain boot sectors 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 the two “outermost” 8 Kbyte boot sectors independently of whether those sectors were protected or unprotected using the method described in “Sector/Sector Block Protection and Unprotection”. The two outermost 8 Kbyte boot sectors are the two sectors containing the lowest addresses in a bottom-boot-configured device, or the two sectors containing the highest addresses in a top-boot-configured device. If the system asserts V IH on the WP#/ACC pin, the de- vice reverts to whether the two outermost 8K Byte boot sectors were last set to be protected or unpro- tected. That is, sector protection or unprotection for these two sectors depends on whether they were last protected or unprotected using the method described in “Sector/Sector Block Protection and Unprotection”. Note that the WP#/ACC pin must not be left floating or unconnected; inconsistent behavior of the device may result. Temporary Sector 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 Tables 8 and 9). 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, for- merly protected sectors can be programmed or erased by selecting the sector addresses. Once V ID is re- moved from the RESET# pin, all the previously pro- tected sectors are protected again. Figure 1 shows the algorithm, and Figure 24 shows the timing diagrams, for this feature. Figure 1. Temporary Sector Unprotect Operation START Perform Erase or Program Operations RESET# = VIH Temporary Sector Unprotect Completed (Note 2) RESET# = VID (Note 1) Notes: 1. All protected sectors unprotected (If WP#/ACC = VIL, outermost boot sectors will remain protected). 2. All previously protected sectors are protected once again. |
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