S29PL-N_07 SPANSION [SPANSION], S29PL-N_07 Datasheet - Page 48

• Manufacturer Part Number: S29PL-N_07
• Description: 256/128/128 Mb (16/8/8 M x 16-Bit) CMOS, 3.0 Volt-only Simultaneous Read/Write, Page-Mode Flash Memory
• Manufacturer: SPANSION [SPANSION]

8.6
48
Advanced Sector Protection Software Examples
Table 8.2
sector. In summary, if the PPB Lock Bit is locked (set to 0), no changes to the PPBs are allowed. The PPB
Lock Bit can only be unlocked (reset to 1) through a hardware reset or power cycle. See also
on page 44
Unique Device PPB Lock Bit
Device returns to reading array.
0 = locked, 1 = unlocked
PASS. Write Lock Register
Address XXXh, Data 90h
Address XXXh, Data 00h
Any Sector
Any Sector
Any Sector
Any Sector
Any Sector
Any Sector
Any Sector
Any Sector
contains all possible combinations of the DYB, PPB, and PPB Lock Bit relating to the status of the
for an overview of the Advanced Sector Protection feature.
Exit Command:
Yes
Enter Lock Register Command:
Program Lock Register Data
S29PL-N MirrorBit
Address XXXh, Data A0h
Perform Polling Algorithm
Address 555h, Data AAh
Address 2AAh, Data 55h
Address 555h, Data 40h
Address 77h*, Data PD
(see Write Operation Status
0
0
0
0
1
1
1
1
D a t a
Figure 8.2 Lock Register Program Algorithm
Write Unlock Cycles:
Table 8.2 Sector Protection Schemes
flowchart)
DQ5 = 1?
Wait 4 μs
Write
Done?
1 = unprotected
0 = protected
No
Yes
S h e e t
Sector PPB
0
0
1
1
0
0
1
1
™
FAIL. Write rest command
to return to reading array.
Flash Family
No
( P r e l i m i n a r y )
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:
Error condition (Exceeded Timing Limits)
1 = unprotected
0 = protected
Sector DYB
x
x
1
0
x
x
0
1
Lock data may only be progammed once.
S29PL-N_00_A5 June 6, 2007
Sector Protection Status
Protected through PPB
Protected through PPB
Protected through DYB
Protected through PPB
Protected through PPB
Protected through DYB
Unprotected
Unprotected
Figure 8.1