EN29LV320 Datasheet, PDF (30/49 Pages) Eon Silicon Solution Inc. – 32 Megabit (4096K x 8-bit / 2048K x 16-bit) Flash Memory Boot Sector Flash Memory, CMOS 3.0 Volt-only

Flowchart 7b. In-System Chip Unprotect Flowchart
START
EN29LV320
Protect all sectors
(groups): 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?
Temporary Chip
Unprotect Mode
Yes
No
All sectors
protected?
Yes
Set up first sector
address
Chip Unprotect: Write 60H to sector
address with A6 = 1,
A1 = 1, A0 = 0
Increment
PLSCNT
Wait 15 ms
Verify Chip 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
PLSCCNT =
1000?
Yes
Device failed
No
Data = 00h?
Yes
Set up next sector
(group) address
Last sector
No
verified?
Chip Unprotect Algorithm
Yes
Remove VID from
RESET#
Write reset
command
Chip Unprotect
complete
This Data Sheet may be revised by subsequent versions ₃₀ ©2004 Eon Silicon Solution, Inc., www.essi.com.tw
or modifications due to changes in technical specifications.
Rev. E, Issue Date: 2006/05/16