參數(shù)資料
型號(hào)： 29PL256N
廠商： Spansion Inc.
英文描述： 256/128/128 Mb (16/8/8 M x 16-Bit) CMOS, 3.0 Volt-only Simultaneous Read/Write, Page-Mode Flash Memory
中文描述： 256/128/128字節(jié)（16/8/8 M中的x 16位），3.0伏的CMOS只同步讀/寫，頁(yè)模式閃存
文件頁(yè)數(shù)： 46/74頁(yè)
文件大?。?/td> 1968K
代理商： 29PL256N
46
S29PL-N MirrorBit
Flash Family
S29PL-N_00_A5 June 6, 2007
D a t a
S h e e t
( P r e l i m i n a r y )
8.2
Persistent Protection Bits
The Persistent Protection Bits are unique and nonvolatile for each sector and have the same endurances as
the Flash memory. Preprogramming and verification prior to erasure are handled by the device, and therefore
do not require system monitoring.
Notes
1. Each PPB is individually programmed and all are erased in parallel.
2. Entry command disables reads and writes for the bank selected.
3. Reads within that bank return the PPB status for that sector.
4. Reads from other banks are allowed while writes are not allowed.
5. All Reads must be performed using the Asynchronous mode.
6. The specific sector addresses (A23 – A14 PL256N and A22 – A14 PL127N/PL129N) are written at
the same time as the program command.
7. If the PPB Lock Bit is set, the PPB Program or erase command does not execute and times-out
without programming or erasing the PPB.
8. There are no means for individually erasing a specific PPB and no specific sector address is
required for this operation.
9. Exit command must be issued after the execution which resets the device to read mode and re-
enables reads and writes for Bank A.
10.The programming state of the PPB for a given sector can be verified by writing a PPB Status Read
Command to the device as described by the flow chart below.
8.3
Dynamic Protection Bits
Dynamic Protection Bits are volatile and unique for each sector and can be individually modified. DYBs only
control the protection scheme for unprotected sectors that have their PPBs cleared (erased to
1
). By issuing
the DYB Set or Clear command sequences, the DYBs are set (programmed to
0
) or cleared (erased to
1
),
thus placing each sector in the protected or unprotected state respectively. This feature allows software to
easily protect sectors against inadvertent changes yet does not prevent the easy removal of protection when
changes are needed.
Notes
1. The DYBs can be set (programmed to
0
) or cleared (erased to
1
) as often as needed. When the
parts are first shipped, the PPBs are cleared (erased to
1
) and upon power up or reset, the DYBs
can be set or cleared depending upon the ordering option chosen.
2. If the option to clear the DYBs after power up is chosen, (erased to
1
), then the sectors may be
modified depending upon the PPB state of that sector.
3. The sectors would be in the protected state If the option to set the DYBs after power up is chosen
(programmed to
0
).
4. It is possible to have sectors that are persistently locked with sectors that are left in the dynamic
state.
5. The DYB Set or Clear commands for the dynamic sectors signify protected or unprotected state of
the sectors respectively. However, if there is a need to change the status of the persistently locked
sectors, a few more steps are required. First, the PPB Lock Bit must be cleared by either putting
the device through a power-cycle, or hardware reset. The PPBs can then be changed to reflect the
desired settings. Setting the PPB Lock Bit once again locks the PPBs, and the device operates
normally again.
6. To achieve the best protection, it is recommended to execute the PPB Lock Bit Set command early
in the boot code and protect the boot code by holding WP# = V
IL
. Note that the PPB and DYB bits
have the same function when WP#/ACC = V
HH
as they do when WP#/ACC = V
IH
.
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