AM29LV800DB-70ED Spansion Inc., AM29LV800DB-70ED Datasheet - Page 16

• Manufacturer Part Number: AM29LV800DB-70ED
• Description: Flash Memory IC
• Manufacturer: Spansion Inc.
• Series: AM29r

Specifications of AM29LV800DB-70ED

• Memory Size: 8Mbit
• Package/case: 48-TSOP
• Supply Voltage Max: 3V
• Leaded Process Compatible: Yes
• Peak Reflow Compatible (260 C): Yes
• Access Time, Tacc: 70nS
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

L = Logic Low = V
Sector Protection/Unprotection
The hardware sector protection feature disables
both program and erase operations in any
sector. The hardware sector unprotection
feature re-enables both program and erase
operations in previously protected sectors.
The device is shipped with all sectors unpro-
tected. AMD offers the option of programming
and protecting sectors at its factory prior to
shipping the device through AMD’s Express-
Flash™ Service. Contact an AMD representative
for details.
It is possible to determine whether a sector is
protected or unprotected. See “Autoselect
Mode” for details.
Sector Protection/unprotection can be imple-
mented via two methods.
The prim ary method req uires V
RESET# pin only, and can be implemented
either in-system or via programming equip-
ment. Figure 2 shows the algorithms and Figure
1 shows the timing diagram. This method uses
14
Manufacturer ID: AMD
Device ID:
Am29LV800B
(Top Boot Block)
Device ID:
Am29LV800B
(Bottom Boot
Block)
Sector Protection
Verification
Description
Table 4. Am29LV800D Autoselect Codes (High Voltage Method)
IL
Mode CE# OE#
, H = Logic High = V
Word
Word
Byte
Byte
L
L
L
L
L
L
L
L
L
L
L
L
IH
WE
I D
#
H
H
H
H
H
H
, SA = Sector Address, X = Don’t care.
P R E L I M I N A R Y
on the
A1
A1
SA
to
8
2
X
X
X
Am29LV800D
A1
A1
to
1
0
X
X
X
X
V
V
V
V
A9
standard microprocessor bus cycle timing. For
sector unprotect, all unprotected sectors must
first be protected prior to the first sector unpro-
tect write cycle.
The alternate method intended only for pro-
gramming equipment requires V
pin A9 and OE#. This method is compatible with
programmer routines written for earlier 3.0 volt-
only AMD flash devices. Publication number
20536 contains further details; contact an AMD
representative to request a copy.
Temporary Sector Unprotect
This feature allows temporary unprotection of
previously protected sectors to change data
in-system. The Sector Unprotect mode is acti-
vated by setting the RESET# pin to V
this mode, formerly protected sectors can be
programmed or erased by selecting the sector
addresses. Once V
RESET# pin, all the previously protected sectors
are protected again. Figure 1 shows the algo-
ID
ID
ID
ID
A8
A7
to
X
X
X
X
A6
L
L
L
L
Am29LV800D_00_A4_E January 21, 2005
A5
A2
to
X
X
X
X
A1
H
L
L
L
ID
is removed from the
A0
H
H
L
L
DQ15
DQ8
22h
22h
to
X
X
X
X
X
ID
(unprotecte
on address
(protected)
ID
. During
DQ7
DQ0
DAh
DAh
01h
5Bh
5Bh
01h
00h
to
d)