AM29LV800DT-90ED Spansion Inc., AM29LV800DT-90ED Datasheet - Page 15

• Manufacturer Part Number: AM29LV800DT-90ED
• Description: Flash Memory IC
• Manufacturer: Spansion Inc.
• Series: AM29r

Specifications of AM29LV800DT-90ED

• Memory Size: 8Mbit
• Package/case: 48-TSOP
• Supply Voltage Max: 3V
• Leaded Process Compatible: Yes
• Peak Reflow Compatible (260 C): Yes
• Access Time, Tacc: 90nS
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Legend: L = Logic Low = V
Sector Protection/Unprotection
The hardware sector protection feature disables both
program and erase operations in any sector. The hard-
ware sector unprotection feature re-enables both pro-
gram and erase operations in previously protected
sectors.
The device is shipped with all sectors unprotected.
AMD offers the option of programming and protecting
sectors at its factory prior to shipping the device
through AMD’s ExpressFlash™ Service. Contact an
AMD representative for details.
It is possible to determine whether a sector is pro-
tected or unprotected. See “Autoselect Mode” for de-
tails.
Sector Protection/unprotection can be implemented
via two methods.
The primary method requires V
only, and can be implemented either in-system or via
programming equipment. Figure 2 shows the algo-
rithms and Figure 23 shows the timing diagram. This
method uses standard microprocessor bus cycle tim-
ing. For sector unprotect, all unprotected sectors must
first be protected prior to the first sector unprotect
write cycle.
The alternate method intended only for programming
equipment requires V
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.
Am29LV800D_00_A6 May 5, 2006
Manufacturer ID: AMD
Device ID:
Am29LV800B
(Top Boot Block)
Device ID:
Am29LV800B
(Bottom Boot Block)
Sector Protection Verification
Description
Mode
Word
Word
Byte
Byte
ID
Table 4. Am29LV800D Autoselect Codes (High Voltage Method)
on address pin A9 and OE#.
IL
, H = Logic High = V
CE#
L
L
L
L
L
L
ID
on the RESET# pin
OE#
L
L
L
L
L
L
WE#
H
H
H
H
H
H
IH
D A T A
, SA = Sector Address, X = Don’t care.
A18
A12
SA
to
X
X
X
Am29LV800D
A11
A10
to
X
X
X
X
S H E E T
V
V
V
V
A9
Temporary Sector Unprotect
This feature allows temporary unprotection of previ-
ously protected sectors to change data in-system. The
Sector Unprotect mode is activated by setting the RE-
SET# pin to V
sectors can be programmed or erased by selecting the
sector addresses. Once V
SET# pin, all the previously protected sectors are
protected again. Figure 1 shows the algorithm, and
Figure 22 shows the timing diagrams, for this feature.
Figure 1. Temporary Sector Unprotect Operation
Notes:
1. All protected sectors unprotected.
2. All previously protected sectors are protected once
ID
ID
ID
ID
again.
A8
A7
to
X
X
X
X
A6
L
L
L
L
ID
. During this mode, formerly protected
A5
A2
to
X
X
X
X
Unprotect Completed
Program Operations
Temporary Sector
Perform Erase or
A1
RESET# = V
RESET# = V
H
L
L
L
(Note 1)
(Note 2)
START
ID
A0
H
H
L
L
is removed from the RE-
DQ15
DQ8
22h
22h
ID
to
IH
X
X
X
X
X
(unprotected)
(protected)
DQ7
DQ0
DAh
DAh
5Bh
5Bh
01h
01h
00h
to
13