參數(shù)資料
型號(hào)： S29CD016G0JFFM012
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(dòng)，同步讀/寫閃存與VersatileI內(nèi)存/輸出
文件頁(yè)數(shù)： 37/87頁(yè)
文件大小： 792K
代理商： S29CD016G0JFFM012
November 14, 2005 S29CD-G_00_B0
S29CD-G Flash Family
35
P r e l i m i n a r y
commands to the Non-Volatile PPBs. In effect, the PPB Lock Bit locks the PPBs into the current
state. The only way to clear the PPB Lock is to go through a power cycle. System boot code can
determine if any changes to the PPB are needed e.g. to allow new system code to be downloaded.
If no changes are needed then the boot code can set the PPB Lock to disable any further changes
to the PPBs during system operation.
The WP# write protect pin adds a final level of hardware protection to the two outermost 8 Kbytes
sectors in the 75% bank. When this pin is low it is not possible to change the contents of these
two sectors.
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 Write command sequence is all that is necessary. The DYB write com-
mand for the dynamic sectors switch the DYBs to signify protected and unprotected, respectively.
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 disabled 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.
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
.
Table 35. Sector Protection Schemes
Table 35
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, and the PPB lock is set, the sector is protected and the protection
can not be removed until the next power cycle clears the PPB lock. If the PPB is cleared, the sector
can be dynamically locked or unlocked. The DYB then controls whether or not the sector is pro-
tected 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 command to a protected sector enables status polling for ap-
proximately 1 μs before the device returns to read mode without having modified the contents of
the protected sector. An erase command to a protected sector enables status polling for approx-
imately 50 μs after which the device returns to read mode without having erased the protected
sector.
The programming of the DYB, PPB, and PPB lock for a given sector can be verified by writing a
DYB/PPB/PPB lock verify command to the device.
Persistent Sector Protection Mode Locking Bit
Like the password mode locking bit, a Persistent Sector Protection mode locking bit exists to guar-
antee that the device remain in software sector protection. Once set, the Persistent Sector
Protection locking bit prevents programming of the password protection mode locking bit. This
guarantees that an unauthorized user could not place the device in password protection mode.
DY B
PPB
PPB Lock
Sector State
0
0
0
Unprotected—PPB and DYB are changeable
0
0
1
Unprotected—PPB not changeable, DYB is changeable
0
1
0
Protected—PPB and DYB are changeable
1
0
0
1
1
0
0
1
1
Protected—PPB not changeable, DYB is changeable
1
0
1
1
1
1
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
S29CD016G0JFFM100 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
S29CD016G0JFFM102 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
S29CD016G0JFFM110 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
S29CD016G0JFFM112 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
S29CD016G0JFFM200 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
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