- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄365399 > S29NS128N0SBJW002 (SPANSION LLC) Simultaneous Read/Write, Multiplexed, Burst Mode Flash Memory PDF資料下載
參數(shù)資料
| 型號： | S29NS128N0SBJW002 |
| 廠商： | SPANSION LLC |
| 元件分類： | DRAM |
| 英文描述： | Simultaneous Read/Write, Multiplexed, Burst Mode Flash Memory |
| 中文描述： | 8M X 16 FLASH 1.8V PROM, 80 ns, PBGA44 |
| 封裝： | 9.20 X 8 MM, LEAD FREE, FBGA-44 |
| 文件頁數(shù)： | 24/86頁 |
| 文件大?。?/td> | 1036K |
| 代理商： | S29NS128N0SBJW002 |
第1頁第2頁第3頁第4頁第5頁第6頁第7頁第8頁第9頁第10頁第11頁第12頁第13頁第14頁第15頁第16頁第17頁第18頁第19頁第20頁第21頁第22頁第23頁當(dāng)前第24頁第25頁第26頁第27頁第28頁第29頁第30頁第31頁第32頁第33頁第34頁第35頁第36頁第37頁第38頁第39頁第40頁第41頁第42頁第43頁第44頁第45頁第46頁第47頁第48頁第49頁第50頁第51頁第52頁第53頁第54頁第55頁第56頁第57頁第58頁第59頁第60頁第61頁第62頁第63頁第64頁第65頁第66頁第67頁第68頁第69頁第70頁第71頁第72頁第73頁第74頁第75頁第76頁第77頁第78頁第79頁第80頁第81頁第82頁第83頁第84頁第85頁第86頁
22
S29NS-N MirrorBit Flash Family
S29NS-N_00_A12 June 13, 2006
D a t a
S h e e t
( A d v a n c e
I n f o r m a t i o n )
Note: Dynamic protection bits revert back to their default values after programming device’s “Lock Register.”
It is possible to have sectors that have been persistently locked, and sectors that are left in the dynamic state.
The sectors in the dynamic state are all unprotected. If there is a need to protect some of them, a simple DYB
Set command sequence is all that is necessary. The DYB Set or Clear command 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 will lock the PPBs, and the
device operates normally again.
Note: To achieve the best protection, it’s 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 ACC = V
HH
as they do when ACC = V
IH
.
Table 8.10
contains all possible combinations of the DYB, PPB, and PPB Lock relating to the status of the
sector.
In summary, if the PPB is set (programmed to “0”), and the PPB Lock is set (programmed to “0”), the sector is
protected and the protection can not be removed until the next power cycle clears (erase to “1”) the PPB Lock
Bit. Once the PPB Lock Bit is cleared (erased to “1”), the sector can be persistently locked or unlocked.
Likewise, if both PPB Lock Bit or PPB is cleared (erased to “1”) the sector can then be dynamically locked or
unlocked. The DYB then controls whether or not the sector is protected or unprotected.
If the user attempts to program or erase a protected sector, the device ignores the command and returns to
read mode. A program or erase command to a protected sector enables status polling and returns to read
mode without having modified the contents of the protected sector.
The programming of the DYB, PPB, and PPB Lock for a given sector can be verified by writing individual
status read commands DYB Status, PPB Status, and PPB Lock Status to the device.
8.15
Persistent Sector Protection Mode Lock Bit
A Persistent Mode Lock Bit exists to guarantee that the device remain in software sector protection. Once
programmed (set to “0”), the Persistent Mode Lock Bit prevents programming of the Password Mode Lock Bit.
This guarantees that now, a hacker cannot place the device in Password Sector Protection Mode.
8.16
Password Sector Protection
The Password Sector Protection Mode method allows an even higher level of security than the Persistent
Sector Protection Mode. There are two main differences between the Persistent Sector Protection Mode and
the Password Sector Protection Mode:
When the device is first powered up, or comes out of a reset cycle, the
PPB Lock Bit is set to the locked
state
, rather than cleared to the unlocked state.
The only means to clear the PPB Lock Bit is by writing a unique
64-bit Password
to the device.
The Password Sector Protection method is otherwise identical to the Persistent Sector Protection method.
A 64-bit password is the only additional tool utilized in this method.
Table 8.10
Sector Protection Schemes
DYB
PPB
PPB Lock
Sector State
1
1
1
Sector Unprotected
0
1
1
Sector Protected through DYB
1
0
1
Sector Protected through PPB
0
0
1
Sector Protected through PPB and DYB
1
1
0
Sector Unprotected
0
1
0
Sector Protected through DYB
1
0
0
Sector Protected through PPB
0
0
0
Sector Protected through PPB and DYB
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| S29NS128N0SBJW003 | Simultaneous Read/Write, Multiplexed, Burst Mode Flash Memory |
| S29NS256N0PBJW000 | Simultaneous Read/Write, Multiplexed, Burst Mode Flash Memory |
| S29NS256N0PBJW002 | Simultaneous Read/Write, Multiplexed, Burst Mode Flash Memory |
| S29NS256N0PBJW003 | Simultaneous Read/Write, Multiplexed, Burst Mode Flash Memory |
| S29NS256N0SBJW000 | Simultaneous Read/Write, Multiplexed, Burst Mode Flash Memory |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| S29NS128N0SBJW003 | 制造商:SPANSION 制造商全稱:SPANSION 功能描述:Simultaneous Read/Write, Multiplexed, Burst Mode Flash Memory |
| S29NS128P | 制造商:SPANSION 制造商全稱:SPANSION 功能描述:MirrorBit Flash Family |
| S29NS128P0PBJW000 | 功能描述:閃存 128M (8MX16) 66MHz Simultaneous R/W RoHS:否 制造商:ON Semiconductor 數(shù)據(jù)總線寬度:1 bit 存儲(chǔ)類型:Flash 存儲(chǔ)容量:2 MB 結(jié)構(gòu):256 K x 8 定時(shí)類型: 接口類型:SPI 訪問時(shí)間: 電源電壓-最大:3.6 V 電源電壓-最小:2.3 V 最大工作電流:15 mA 工作溫度:- 40 C to + 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體: 封裝:Reel |
| S29NS128P0PBJW003 | 制造商:SPANSION 制造商全稱:SPANSION 功能描述:MirrorBit Flash Family |
| S29NS128P0SBJW000 | 制造商:SPANSION 制造商全稱:SPANSION 功能描述:MirrorBit Flash Family |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。