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AM29F400AB-70EC Arkusz danych(PDF) 11 Page - Advanced Micro Devices |
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AM29F400AB-70EC Arkusz danych(HTML) 11 Page - Advanced Micro Devices |
11 / 35 page Am29F400AT/Am29F400AB 11 PRELIMINARY It is possible to determine if a sector is protected in the system by writing an Autoselect command. Performing a read operation at the address location XX02H, where the higher order address bits A12–A17 is the desired sector address, will produce a logical “1” at DQ0 for a protected sector. See Table 3 for Autoselect codes. Temporary Sector Unprotect This feature allows temporary unprotection of previ- ously protected sectors of the Am29F400A device in order to change data in-system. The Sector Unprotect mode is activated by setting the RESET pin to high volt- age (12V). During this mode, formerly protected sec- tors can be programmed or erased by selecting the sector addresses. Once the 12 V is taken away from the RESET pin, all the previously protected sectors will be protected again. Refer to Figures 16 and 17. Command Definitions Device operations are selected by writing specific ad- dress and data sequences into the command register. Writing incorrect address and data values or writing them in the improper sequence will reset the device to the read mode. Table 7 defines the valid register command sequences. Note that the Erase Suspend (B0H) and Erase Resume (30H) com- mands are valid only while the Sector Erase operation is in progress. Moreover, both Reset/Read commands are functionally equivalent, resetting the device to the read mode. |
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