May 11, 2006 S29WS-J_00_A6 S29WS128J/064J 59
Data Sheet
track of the number of Password Unlock commands, the order, and when to read the PPB Lock bit
to confirm successful password unlock. In order to relock the device into the Password Mode, the
PPB Lock Bit Set command can be re-issued. Exiting the Password Unlock command is accom
-
plished by writing the Secured Silicon Sector Exit command.
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 (Amax–A12) 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.
After programming a PPB, two additional cycles are needed to determine whether the PPB has
been programmed with margin. After 4th cycle, the device requires approximately 150 µs time
out period for programming the PPB. And then after 5th cycle, the device outputs verify data at
DQ0.
The PPB Program command does not follow the Embedded Program algorithm. Writing the Se-
cured Silicon Sector Exit command or Read/Reset command return the device back to normal
operation.
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.
After erasing the PPBs, two additional cycles are needed to determine whether the PPB has been
erased with margin. After 4th cycle, the device requires approximately 1.5 ms time out period for
erasing the PPB. And then after 5th cycle, the device outputs verify data at DQ0.
It is the responsibility of the user to preprogram all PPBs prior to issuing the All PPB Erase com-
mand. 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. Writing the Secured
Silicon Sector Exit command or Read/Reset command return the device back to normal operation.
PPB Status Command
The programming of the PPB for a given sector can be verified by writing a PPB status verify com-
mand to the device. Writing the Secured Silicon Sector Exit command or Read/Reset command
return the device back to normal operation.
PPB Lock Bit Status Command
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. Writing the Secured Silicon Sector Exit command or Read/
Reset command return the device back to normal operation.
