MX29LV640BT Macronix International, MX29LV640BT Datasheet - Page 50

• Manufacturer Part Number: MX29LV640BT
• Description: 64M-BIT [8M x 8/4M x 16] SINGLE VOLTAGE 3V ONLY FLASH MEMORY
• Manufacturer: Macronix International

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Figure 14. IN-SYSTEM SECTOR GROUP PROTECT/CHIP UNPROTECT ALGORITHMS WITH
P/N:PM1076
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
A6=0, A1=1, A0=0
Write 40h to sector
A6=0, A1=1, A0=0
A6=0, A1=1, A0=0
Protect another
Sector Protect:
sector address
Wait 150us
address with
address with
Cycle=60h?
Data=01h?
RESET#=VID
Wait 1us
PLSCNT=1
Read from
First Write
sector?
START
with
Yes
Yes
No
Yes
PLSCNT=1
Reset
the sector protect algorithm
for all unprotected sectors
sector unprotect address
The indicated portion of
prior to issuing the first
must be performed
Protect all sectors:
50
Chip Unprotect
Increment PLSCNT
PLSCNT=1000?
MX29LV640BT/BB
Algorithm
Device failed
No
Yes
No
No
Remove VID from RESET#
Sector Unprotect complete
Set up first sector address
Verify Sector Unprotect:
Write reset command
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
Sector Unprotect:
sector address
Wait 15 ms
address with
Cycle=60h?
address with
RESET#=VID
Wait 1us
Last sector
PLSCNT=1
All sectors
protected?
Read from
Data=00h?
First Write
verified?
START
with
Yes
Yes
Yes
Yes
No
No
Temporary Sector
PLSCNT=1
Unprotect Mode
REV. 1.2, SEP. 07, 2005
Reset