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AM41DL1634DT85IT 데이터시트(PDF) 21 Page - Advanced Micro Devices |
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AM41DL1634DT85IT 데이터시트(HTML) 21 Page - Advanced Micro Devices |
21 / 63 page 20 Am41DL16x4D P R E L IMINARY 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 “The autoselect mode provides manufacturer and device identification, and sector protection verification, through identifier codes output on DQ7–DQ0. The autoselect codes can be ac- cessed in-system through the command register. Refer to the Autoselect Command Sequence section for more information.Sector/Sector Block Protection and Unprotection”. The two outermost 8 Kbyte boot sectors are the two sectors containing the lowest ad- dresses in a top-boot-configured device, or the two s e ct or s c ontai ning th e hi ghest addr es s e s i n 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 8 Kbyte boot sectors were last set to be protected or unprotected. That is, sector protection or unprotection for these two sectors depends on whether they were last protected or unprotected using the method described in “The au- toselect mode provides manufacturer and device identification, and sector protection verification, through identifier codes output on DQ7–DQ0. The au- toselect codes can be accessed in-system through the command register. Refer to the Autoselect Command Sequence section for more information.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/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 Tables 10 and 11). 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. 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. Figure 1. Temporary Sector Unprotect Operation |
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