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M750000004 Datasheet(PDF) 45 Page - SPANSION

Part # M750000004
Description  128 Megabit (8 M x 16-Bit) CMOS 3.0 Volt-only, Simultaneous Read/Write Flash Memory
PDF  129 Pages
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Manufacturer  SPANSION [SPANSION]
Direct Link  http://www.spansion.com
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M750000004 Datasheet(HTML) 45 Page - SPANSION

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January 14, 2004
Am75PDL191CHHa/Am75PDL193CHHa
43
ADV ANCE
I N FO RMAT I O N
Figure 1.
In-System Sector Protection/
Sector Unprotection Algorithms
Sector Protect:
Write 60h to sector
address with
A7-A0 =
00000010
Set up sector
address
Wait 100 µs
Verify Sector
Protect: Write 40h
to sector address
with A7-A0 =
00000010
Read from
sector address
with A7-A0 =
00000010
START
PLSCNT = 1
RESET# = VID
Wait 4
µs
First Write
Cycle = 60h?
Data = 01h?
Remove VID
from RESET#
Write reset
command
Sector Protect
complete
Yes
Yes
No
PLSCNT
= 25?
Yes
Device failed
Increment
PLSCNT
Temporary Sector
Unprotect Mode
No
Sector Unprotect:
Write 60h to sector
address with
A7-A0 =
01000010
Set up first sector
address
Wait 1.2 ms
Verify Sector
Unprotect: Write
40h to sector
address with
A7-A0 =
00000010
Read from
sector address
with A7-A0 =
00000010
START
PLSCNT = 1
RESET# = VID
Wait 4
µs
Data = 00h?
Last sector
verified?
Remove VID
from RESET#
Write reset
command
Sector Unprotect
complete
Yes
No
PLSCNT
= 1000?
Yes
Device failed
Increment
PLSCNT
Temporary Sector
Unprotect Mode
No
All sectors
protected?
Yes
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
Set up
next sector
address
No
Yes
No
Yes
No
No
Yes
No
Sector Protect
Algorithm
Sector Unprotect
Algorithm
First Write
Cycle = 60h?
Protect another
sector?
Reset
PLSCNT = 1
Remove VID
from RESET#
Write reset
command
Sector Protect
complete
Remove VID
from RESET#
Write reset
command
Sector Unprotect
complete



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