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M700000002 датащи(PDF) 40 Page - SPANSION |
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M700000002 датащи(HTML) 40 Page - SPANSION |
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40 / 128 page ![]() 38 Am70PDL127BDH/Am70PDL129BDH November 25, 2003 AD VAN C E INFORM ATION If the Password Mode Locking Bit is not set, including Persistent Protection Mode, the PPB Lock Bit is cleared after power-up or hardware reset. The PPB Lock Bit is set by issuing the PPB Lock Bit Set com- mand. Once set the only means for clearing the PPB Lock Bit is by issuing a hardware or power-up reset. The Password Unlock command is ignored in Persis- tent Protection Mode. High Voltage Sector Protection Sector protection and unprotection may also be imple- mented using programming equipment. The proce- dure requires high voltage (V ID) to be placed on the RESET# pin. Refer to Figure 1 for details on this pro- cedure. Note that for sector unprotect, all unprotected sectors must first be protected prior to the first sector write cycle. |
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