S71PL254 Datasheet, PDF (59/196 Pages) SPANSION – STACKED MULTI CHIP PRODUCT FLASH MEMORY AND RAM

Advance Information
START
PLSCNT = 1
RESET# = V_ID
Wait 4 µs
Temporary Sector
Unprotect Mode
No _{First Write}
Cycle = 60h?
Yes
Set up sector
address
Sector Protect:
Write 60h to sector
address with
A7-A0 =
00000010
Wait 100 µs
Increment
PLSCNT
No
PLSCNT
= 25?
Yes
Remove V_ID
from RESET#
Write reset
command
Sector Protect
complete
Verify Sector
Protect: Write 40h
to sector address
with A7-A0 =
00000010
Read from
sector address
with A7-A0 =
00000010
Reset
PLSCNT = 1
No
Data = 01h?
Yes
Yes
Protect another
sector?
No
Remove V_ID
from RESET#
Write reset
command
Device failed
Sector Protect
complete
Sector Protect
Algorithm
Protect all sectors:
The indicated portion
of the sector protect
algorithm must be
performed for all
unprotected sectors
prior to issuing the
first sector
unprotect address
Increment
PLSCNT
No
PLSCNT
= 1000?
Yes
Remove V_ID
from RESET#
Write reset
command
Sector Unprotect
complete
Device failed
START
PLSCNT = 1
RESET# = V_ID
Wait 4 µs
First Write ^No
Cycle = 60h?
Temporary Sector
Unprotect Mode
Yes
No _{All sectors}
protected?
Yes
Set up first sector
address
Sector Unprotect:
Write 60h to sector
address with
A7-A0 =
01000010
Wait 1.2 ms
Verify Sector
Unprotect: Write
40h to sector
address with
A7-A0 =
00000010
Read from
sector address
with A7-A0 =
00000010
No
Data = 00h?
Yes
Set up
next sector
address
Last sector ^No
verified?
Yes
Remove V_ID
from RESET#
Write reset
command
Sector Unprotect
complete
Sector Unprotect
Algorithm
Figure 1. In-System Sector Protection/Sector Unprotection Algorithms
August 12, 2004 S29PL127J_064J_032J_MCP_00_A3 S29PL127J/S29PL064J/S29PL032J for MCP
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