EN29LV160B_11 Datasheet, PDF (25/43 Pages) Eon Silicon Solution Inc. – 16 Megabit (2048K x 8-bit / 1024K x 16-bit) Flash Memory Boot Sector Flash Memory, CMOS 3.0 Volt-only

Flowchart 7b. In-System Sector Unprotect Flowchart
START
EN29LV160B
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# = V_ID
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 V_ID from
RESET#
Write reset
command
Sector Unprotect
complete
This Data Sheet may be revised by subsequent versions
25
or modifications due to changes in technical specifications.
© 2004 Eon Silicon Solution, Inc.,
Rev. I, Issue Date: 2011/10/26
www.eonssi.com