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AM42DL640AH Datasheet(PDF) 18 Page - SPANSION |
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AM42DL640AH Datasheet(HTML) 18 Page - SPANSION |
18 / 60 page 16 Am42DL640AH December 5, 2003 ADV ANCE I N FO RMAT I O N method described in “Sector/Sector Block Protection and Unprotection”. If the system asserts V IH on the WP#/ACC pin, the de- vice reverts to whether sectors 0, 1, 140, and 141 were last set to be protected or unprotected. That is, sector protection or unprotection for these sectors de- pends on whether they were last protected or unpro- tected 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. Table 6. WP#/ACC Modes 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 Table 5). 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. During this mode, formerly protected sectors can be programmed or erased by selecting the sector addresses. Once V ID is removed from the RE- SET# pin, all the previously protected sectors are protected again. Figure 1 shows the algorithm, and Figure 26 shows the timing diagrams, for this feature. If the WP#/ACC pin is at V IL, sectors 0, 1, 140, and 141 will remain protected during the Temporary sector Unprotect mode. Figure 1. Temporary Sector Unprotect Operation WP# Input Voltage Device Mode V IL Disables programming and erasing in SA0, SA1, SA140, and SA141 V IH Enables programming and erasing in SA0, SA1, SA140, and SA141 V HH Enables accelerated progamming (ACC). See “Accelerated Program Operation” on page 10. 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, sectors 0, 1, 140, and 141 will remain protected). 2. All previously protected sectors are protected once again. |
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