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S71PL254 Datasheet(PDF) 58 Page - SPANSION |
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S71PL254 Datasheet(HTML) 58 Page - SPANSION |
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58 / 196 page  58 S29PL127J/S29PL064J/S29PL032J for MCP S29PL127J_064J_032J_MCP_00_A3 August 12, 2004 Advance I n f o rmation Bit Set command sets the PPB Lock Bit to a “1” when the Password Mode Lock Bit is not set. 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 command. Once set the only means for clear- ing the PPB Lock Bit is by issuing a hardware or power-up reset. The Password Unlock command is ignored in Persistent Protection Mode. High Voltage Sector Protection Sector protection and unprotection may also be implemented using programming equipment. The procedure requires high voltage (VID) to be placed on the RE- SET# pin. Refer to Figure 1 for details on this procedure. Note that for sector unprotect, all unprotected sectors must first be protected prior to the first sector write cycle. |
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