參數(shù)資料
型號： S29CD016G0JQFI200
廠商： Spansion Inc.
英文描述： 32 Megabit (1M x 32-Bit), 16 Megabit (512K x 32-Bit) 2.5 Volt-only Burst Mode, Dual Boot, Simultaneous Read/ Write Flash Memory with VersatileI/O
中文描述： 32兆位（1米× 32位），16兆位（512k × 32的位），2.5伏，只有突發(fā)模式，雙啟動，同步讀/寫閃存與VersatileI內(nèi)存/輸出
文件頁數(shù)： 38/87頁
文件大?。?/td> 792K
代理商： S29CD016G0JQFI200
36
S29CD-G Flash Family
S29CD-G_00_B0 November 14, 2005
P r e l i m i n a r y
Password Protection Mode
The Password Sector Protection Mode method allows an even higher level of security than the Per-
sistent Sector Protection Mode. There are two main differences between the Persistent Sector
Protection and the Password Sector Protection Mode:
When the device is first powered on, or comes out of a reset cycle, the PPB Lock bit 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 Passw ord
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.
The password is stored in a
one-time programmable ( OTP)
region of the flash memory. Once
the Password Mode Locking Bit is set, the password is permanently set with no means to read,
program, or erase it. The password is used to clear the PPB Lock bit. The Password Unlock com-
mand must be written to the flash, along with a password. The flash device internally compares
the given password with the pre-programmed password. If they match, the PPB Lock bit is
cleared, and the PPBs can be altered. If they do not match, the flash device does nothing. There
is a built-in 2 μs delay for each
password check
. This delay is intended to stop any efforts to run
a program that tries all possible combinations in order to crack the password.
Password and Password Mode Locking Bit
In order to select the Password sector protection scheme, the customer must first program the
password. One method of choosing a password would be to correlate it to the unique Electronic
Serial Number (ESN) of the particular flash device. Another method could generate a database
where all the passwords are stored, each of which correlates to a serial number on the device.
Each ESN is different for every flash device; therefore each password should be different for every
flash device. While programming in the password region, the customer may perform Password
Verify operations.
Once the desired password is programmed in, the customer must then set the Password Mode
Locking Bit. This operation achieves two objectives:
1) It permanently sets the device to operate using the Password Protection Mode. It is not possible
to reverse this function.
2) It also disables
all further commands
to the password region. All program, and read operations
are ignored.
Both of these objectives are important, and if not carefully considered, may lead to unrecoverable
errors. The user must be sure that the Password Protection method is desired when setting the
Password Mode Locking Bit. More importantly, the user must be sure that the password is correct
when the Password Mode Locking Bit is set. Due to the fact that read operations are disabled,
there is no means to verify what the password is afterwards. If the password is lost after setting
the Password Mode Locking Bit, there is no way to clear the PPB Lock bit.
The Password Mode Locking Bit, once set, prevents reading the 64-bit password on the DQ bus
and further password programming. The Password Mode Locking Bit is not erasable. Once Pass-
word Mode Locking Bit is programmed, the Persistent Sector Protection Locking Bit is disabled
from programming, guaranteeing that no changes to the protection scheme are allowed.
64-bit Passw ord
The 64-bit Password is located in its own memory space and is accessible through the use of the
Password Program and Verify commands (see
Password Verify Command
). The password function
相關(guān)PDF資料
PDF描述
S29CD016G0MFAA002 32 Megabit (1M x 32-Bit), 16 Megabit (512K x 32-Bit) 2.5 Volt-only Burst Mode, Dual Boot, Simultaneous Read/ Write Flash Memory with VersatileI/O
S29CD016G0MFAA010 32 Megabit (1M x 32-Bit), 16 Megabit (512K x 32-Bit) 2.5 Volt-only Burst Mode, Dual Boot, Simultaneous Read/ Write Flash Memory with VersatileI/O
S29CD016G0MFAA012 32 Megabit (1M x 32-Bit), 16 Megabit (512K x 32-Bit) 2.5 Volt-only Burst Mode, Dual Boot, Simultaneous Read/ Write Flash Memory with VersatileI/O
S29CD016G0JFAA000 32 Megabit (1M x 32-Bit), 16 Megabit (512K x 32-Bit) 2.5 Volt-only Burst Mode, Dual Boot, Simultaneous Read/ Write Flash Memory with VersatileI/O
S29CD016G0JFAA002 32 Megabit (1M x 32-Bit), 16 Megabit (512K x 32-Bit) 2.5 Volt-only Burst Mode, Dual Boot, Simultaneous Read/ Write Flash Memory with VersatileI/O
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
S29CD016G0JQFI202 制造商:SPANSION 制造商全稱:SPANSION 功能描述:32 Megabit (1M x 32-Bit), 16 Megabit (512K x 32-Bit) 2.5 Volt-only Burst Mode, Dual Boot, Simultaneous Read/ Write Flash Memory with VersatileI/O
S29CD016G0JQFI210 制造商:SPANSION 制造商全稱:SPANSION 功能描述:32 Megabit (1M x 32-Bit), 16 Megabit (512K x 32-Bit) 2.5 Volt-only Burst Mode, Dual Boot, Simultaneous Read/ Write Flash Memory with VersatileI/O
S29CD016G0JQFI212 制造商:SPANSION 制造商全稱:SPANSION 功能描述:32 Megabit (1M x 32-Bit), 16 Megabit (512K x 32-Bit) 2.5 Volt-only Burst Mode, Dual Boot, Simultaneous Read/ Write Flash Memory with VersatileI/O
S29CD016G0JQFM000 制造商:SPANSION 制造商全稱:SPANSION 功能描述:32 Megabit (1M x 32-Bit), 16 Megabit (512K x 32-Bit) 2.5 Volt-only Burst Mode, Dual Boot, Simultaneous Read/ Write Flash Memory with VersatileI/O
S29CD016G0JQFM002 制造商:SPANSION 制造商全稱:SPANSION 功能描述:32 Megabit (1M x 32-Bit), 16 Megabit (512K x 32-Bit) 2.5 Volt-only Burst Mode, Dual Boot, Simultaneous Read/ Write Flash Memory with VersatileI/O
發(fā)布緊急采購，3分鐘左右您將得到回復。

采購需求

(若只采購一條型號，填寫一行即可)

發(fā)布成功！您可以繼續(xù)發(fā)布采購。也可以進入我的后臺，查看報價

發(fā)布成功！您可以繼續(xù)發(fā)布采購。也可以進入我的后臺，查看報價

*型號 *數(shù)量 廠商 批號 封裝
添加更多采購

我的聯(lián)系方式

*
*
*