MX29LV640BU Macronix International, MX29LV640BU Datasheet - Page 46

• Manufacturer Part Number: MX29LV640BU
• Description: 64M-BIT [4M x 16] CMOS EQUAL SECTOR FLASH MEMORY
• Manufacturer: Macronix International

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Figure 14. IN-SYSTEM SECTOR GROUP PROTECT/CHIP UNPROTECT ALGORITHMS WITH
P/N:PM1081
Sector Protect
Increment PLSCNT
Temporary Sector
Unprotect Mode
Algorithm
PLSCNT=25?
Device failed
RESET#=VID
Yes
No
No
No
Remove VID from RESET#
Sector Protect complete
Write reset command
Verify Sector Protect:
Set up sector address
Write 60h to sector
Write 40h to sector
A6=0, A1=1, A0=0
A6=0, A1=1, A0=0
A6=0, A1=1, A0=0
Protect another
Sector Protect:
sector address
RESET#=VID
Wait 150us
address with
address with
Cycle=60h?
Data=01h?
Wait 1us
Read from
PLSCNT=1
First Write
sector?
START
with
Yes
Yes
No
Yes
PLSCNT=1
Reset
the sector protect algorithm
46
for all unprotected sectors
sector unprotect address
The indicated portion of
prior to issuing the first
must be performed
Protect all sectors:
Chip Unprotect
Increment PLSCNT
PLSCNT=1000?
Algorithm
Device failed
MX29LV640BU
No
Yes
No
No
Remove VID from RESET#
Set up first sector address
Chip Unprotect complete
Write reset command
Verify Chip Unprotect:
Write 60h to sector
Write 40h to sector
A6=1, A1=1, A0=0
A6=1, A1=1, A0=0
A6=1, A1=1, A0=0
Chip Unprotect:
sector address
RESET#=VID
Wait 15 ms
address with
address with
Cycle=60h?
Wait 1us
Last sector
PLSCNT=1
All sectors
protected?
Read from
Data=00h?
First Write
verified?
START
with
Yes
Yes
Yes
Yes
No
No
REV. 1.0, MAR. 08, 2005
PLSCNT=1
Temporary Sector
Unprotect Mode
Reset