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AM29DS323DB50EIN 데이터시트(PDF) 20 Page - Advanced Micro Devices |
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AM29DS323DB50EIN 데이터시트(HTML) 20 Page - Advanced Micro Devices |
20 / 56 page 18 Am29DS323D 23480A5 October 10, 2006 D A TA SH EET The alternate method intended only for programming equipment requires V ID on address pin A9 and OE#. This method is compatible with programmer routines written for earlier 1.8 volt-only AMD flash devices. Contact an AMD representative for further details. The device is shipped with all sectors unprotected. AMD offers the option of programming and protecting sectors at its factory prior to shipping the device through AMD’s ExpressFlash™ Service. Contact an AMD representative for details. It is possible to determine whether a sector is pro- tected or unprotected. See the Autoselect Mode section 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 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 “Sec- tor/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 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 (9.0 V – 11.0 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 24 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# = VID (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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