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전자부품 데이터시트 검색엔진 |
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전자부품 데이터시트 검색엔진 |
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S29CD032G0JQAI002 데이터시트(PDF) 59 Page - SPANSION |
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S29CD032G0JQAI002 데이터시트(HTML) 59 Page - SPANSION |
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59 / 93 page  March 22, 2004 30606B0 S29CD032G 59 Ad va nc e In forma t i o n All PPB Erase Command The All PPB Erase command is used to erase all PPBs in bulk. There is no means for individually erasing a specific PPB. Unlike the PPB program, no specific sector address is required. However, when the PPB erase command is written (60h) and A6 = 1, all Sector PPBs are erased in parallel. If the PPB Lock Bit is set the ALL PPB Erase command will not execute and the command will time-out without erasing the PPBs. The host system must determine whether all PPB has been fully erased by noting the status of DQ0 in the sixth cycle of the All PPB Erase com- mand. If DQ0 = 1, the entire six-cycle All PPB Erase command sequence must be reissued until DQ0 = 1. It is the responsibility of the user to preprogram all PPBs prior to issuing the All PPB Erase command. If the user attempts to erase a cleared PPB, over-erasure may occur making it difficult to program the PPB at a later time. Also note that the total number of PPB program/erase cycles is limited to 100 cycles. Cycling the PPBs beyond 100 cycles is not guaranteed. The All PPB Erase command is permitted if the SecSi sector is enabled. DYB Write The DYB Write 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 will clear the DYBs. The bank address is latched when the command is written. The DYB Write command is permitted if the SecSi 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 will clear the DYBs. The bank address is latched when the command is written. The PPB Lock command is permitted if the SecSi sector is enabled. DYB Status The programming of the DYB for a given sector can be verified by writing a DYB status verify command to the device. PPB Status The programming of the PPB for a given sector can be verified by writing a PPB status verify command 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 SecSi Sector Protection, Password Locking, Persistent Sector Protection Mode |
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