參數(shù)資料
型號: S29NS256P
廠商: Spansion Inc.
英文描述: MirrorBit Flash Family
中文描述: MirrorBit閃存系列
文件頁數(shù): 58/86頁
文件大?。?/td> 2234K
代理商: S29NS256P
58
S29NS-P MirrorBit
TM
Flash Family
S29NS-P_00_A1 February 20, 2007
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 )
Figure 7.3
Lock Register Program Algorithm
7.6
Advanced Sector Protection Software Examples
Write Unlock Cycles:
Address 555h, Data AAh
Address 2AAh, Data 55h
Write
Enter Lock Register Command:
Address 555h, Data 40h
Program Lock Register Data
Address XXXh, Data A0h
Address 77h*, Data PD
Unlock Cycle 1
Unlock Cycle 2
XXXh = Address don’t care
* Not on future devices
Program Data (PD): See text for Lock Register
definitions
Caution:
Lock register can only be progammed
once.
Wait 4
μ
s (recommended)
PASS. Write Lock Register
Exit Command:
Address XXXh, Data 90h
Address XXXh, Data 00h
Device returns to reading array.
Perform Polling Algorithm
(see Write Operation Status
flowchart)
Yes
Yes
No
No
Done
DQ5 = 1
Error condition (Exceeded Timing Limits)
FAIL. Write rest command
to return to reading array.
Table 7.1
Sector Protection Schemes
Unique Device PPB Lock Bit
0 = locked
1 = unlocked
Sector PPB
0 = protected
1 = unprotected
Sector DYB
0 = protected
1 = unprotected
Sector Protection Status
Any Sector
0
0
x
Protected through PPB
Any Sector
0
0
x
Protected through PPB
Any Sector
0
1
1
Unprotected
Any Sector
0
1
0
Protected through DYB
Any Sector
1
0
x
Protected through PPB
Any Sector
1
0
x
Protected through PPB
Any Sector
1
1
0
Protected through DYB
Any Sector
1
1
1
Unprotected
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