Flowchart 7b. In-System Sector Unprotect Flowchart
EN29LV160J
START
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 (see
Diagram 7a.)
PLSCNT = 1
RESET# = VID
Wait 1 µS
No
First Write
Cycle = 60h?
Yes
No
All sectors
protected?
Yes
Set up first sector
address
Sector Unprotect: Write 60H to
sector address with A6 = 1,
A1 = 1, A0 = 0
Temporary Sector
Unprotect Mode
Increment
PLSCNT
Wait 15 ms
Verify Sector Unprotect:
Write 40h to sector address
with A6 = 1, A1 = 1, A0 =0
Wait 0.4 µS
Read from sector address with
A6 = 1, A1 = 1, A0 = 0
No
Sector
Unprotect
Algorithm
PLSCCNT =
1000?
Yes
Device failed
No
Data = 00h?
Set up next sector
address
Yes
Last sector No
verified?
Yes
Remove VID from
RESET#
Write reset
command
4800 Great America Parkway, Suite 202
25
Santa Clara, CA 95054
Rev 0.3 Release Date: 2002/01/30
Sector Unprotect
complete
Tel: 408-235-8680
Fax: 408-235-8685