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전자부품 데이터시트 검색엔진 |
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전자부품 데이터시트 검색엔진 |
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AM29BDD160G 데이터시트(PDF) 45 Page - Advanced Micro Devices |
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AM29BDD160G 데이터시트(HTML) 45 Page - Advanced Micro Devices |
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45 / 79 page  June 7, 2006 Am29BDD160G 43 lected (WORD# = 0). Writing the Password Unlock command is address order specific. In other words, for the x32 data bus configuration, the lower 32 bits of the password are written first and then the upper 32 bits of the password are written. For the x16 data bus config- uration, the lower address A0:A -1= 00, the next Pass- word Unlock command is to A0:A -1 = 01, then to A0:A -1= 10, and finally to A0:A-1= 11. Writing out of se- quence results in the Password Unlock not returning a match with the password and the PPB Lock Bit re- mains set. Once the Password Unlock command is entered, the RDY/BSY# pin goes LOW indicating that the device is busy. Also, reading the small bank (25% bank) results in the DQ6 pin toggling, indicating that the Password Unlock function is in progress. Reading the large bank (75% bank) returns actual array data. Approximately 1uSec is required for each portion of the unlock. Once the first portion of the password unlock completes (RDY/BSY# is not driven and DQ6 does not toggle when read), the Password Unlock command is issued again, only this time with the next part of the pass- word. If WORD# = 1, the second Password Unlock command is the final command before the PPB Lock Bit is cleared (assuming a valid password). If WORD# = 0, this is the fourth Password Unlock command. In x16 mode, four Password Unlock commands are re- quired to successfully clear the PPB Lock Bit. As with the first Password Unlock command, the RY/BY# sig- nal goes LOW and reading the device results in the DQ6 pin toggling on successive read operations until complete. It is the responsibility of the microprocessor to keep track of the number of Password Unlock com- mands (2 for x32 bus and 4 for x16 bus), the order, and when to read the PPB Lock bit to confirm suc- cessful password unlock The Password Unlock command is permitted if the SecSi sector is enabled. PPB Program Command The PPB Program command is used to program, or set, a given PPB. Each PPB is individually pro- grammed (but is bulk erased with the other PPBs). The specific sector address (A18–A11) are written at the same time as the program command 60h with A6 = 0. If the PPB Lock Bit is set and the corresponding PPB is set for the sector, the PPB Program command will not execute and the command will time-out without programming the PPB. The host system must determine whether a PPB has been fully programmed by noting the status of DQ0 in the sixth cycle of the PPB Program command. If DQ0 = 0, the entire six-cycle PPB Program command se- quence must be reissued until DQ0 = 1. All PPB Erase Command The All PPB Erase command is used to erase all PPBs in bulk. There is no means for individually eras- ing a specific PPB. Unlike the PPB program, no spe- cific 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 command. 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-era- sure 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 com- mand 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 vol- atile 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 sec- tor 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. |
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