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S29CD032G0JQAI010 데이터시트(PDF) 55 Page - SPANSION |
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S29CD032G0JQAI010 데이터시트(HTML) 55 Page - SPANSION |
55 / 87 page November 14, 2005 S29CD-G_00_B0 S29CD-G Flash Family 53 Pr el im i n a r y Since this is a volatile bit, removing power or resetting the device clears the DYBs. The bank ad- dress is latched when the command is written. The DYB Write command is permitted if the Secured Silicon sector is enabled. PPB Lock Bit Set The PPB Lock Bit set command is used for setting the DYB, which is a volatile bit that is cleared at reset. There is one DYB per sector. If the PPB is set, the sector is protected regardless of the value of the DYB. If the PPB is cleared, setting the DYB to a 1 protects the sector from programs or erases. Since this is a volatile bit, removing power or resetting the device clears the DYBs. The bank address is latched when the command is written. The PPB Lock command is permitted if the Secured Silicon sector is enabled. DYB Status The programming of the DYB for a given sector can be verified by writing a DYB status verify com- mand to the device. PPB Status The programming of the PPB for a given sector can be verified by writing a PPB status verify com- mand to the device. PPB Lock Bit Status The programming of the PPB Lock Bit for a given sector can be verified by writing a PPB Lock Bit status verify command to the device. Non-volatile Protection Bit Program And Erase Flow The device uses a standard command sequence for programming or erasing the Secured Silicon Sector Protection, Password Locking, Persistent Sector Protection Mode Locking, or Persistent Pro- tection Bits. Unlike devices that have the Single High Voltage Sector Unprotect/Protect feature, the device has the standard two-cycle unlock followed by 60h, which places the device into non- volatile bit program or erase mode. Once the mode is entered, the specific non-volatile bit status is read on DQ0. Figure 4 on page 45 shows a typical flow for programming the non-volatile bit and Figure 5 on page 48 shows a typical flow for erasing the non-volatile bits. The Secured Silicon Sector Protection, Password Locking, Persistent Sector Protection Mode Locking bits are not erasable after they are programmed. However, the PPBs are both erasable and programmable (depending upon device security). Unlike Single High Voltage Sector Protect/Unprotect, the A6 pin no longer functions as the pro- gram/erase selector nor the program/erase margin enable. Instead, this function is accomplished by issuing the specific command for either program (68h) or erase (60h). In asynchronous mode, the DQ6 toggle bit indicates whether the program or erase sequence is active. (In synchronous mode, ADV# indicates the status.) If the DQ6 toggle bit toggles with ei- ther OE# or CE#, the non-volatile bit program or erase operation is in progress. When DQ6 stops toggling, the value of the non-volatile bit is available on DQ0. |
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