D A T A S H E E T
ing a specific PPB. Unlike the PPB program, no spe-
PPB Program Command
cific sector address is required. However, when the
PPB erase command is written (60h), 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
issuing “WP/60h” at the fourth bus cycle, the device re-
quires a time out period of approximately 1.5 ms to
erase the PPB. Writing “SBA+WP/40h” at the fifth bus
cycle produces verify data at DQ0. If DQ0 = 0, the
PPB is erased. If not, the system must repeat this pro-
gram sequence from the fourth cycle of “WP/60h”.
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. If the
PPB Lock Bit is set and the correspondingly PPB is
set for the sector, the PPB Program command will not
execute and the command will time out without pro-
gramming the PPB. After issuing “SBA+WP/68h” at
the fourth bus cycle, the device requires a time out pe-
riod of approximately 150 µs to program the PPB.
Writing “SBA+WP/48” at the fifth bus cycle produces
verify data at DQ0. If DQ0 = 1, the PPB is pro-
grammed. If not, the system must repeat this program
sequence from the fourth cycle of “SBA+WP/68h”.
It is the responsibility of the system to preprogram all
PPBs prior to issuing the All PPB Erase command. If
the system 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 PPB Program command does not follow the
Embedded Program algorithm. Writing the SecSi
Sector Exit command or Read/Reset command return
the device back to normal operation.
Writing the SecSi Sector Exit command or Read/Re-
set command return the device 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 eras-
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