AM29DL800BT-90WBI Spansion Inc., AM29DL800BT-90WBI Datasheet - Page 16

• Manufacturer Part Number: AM29DL800BT-90WBI
• Manufacturer: Spansion Inc.

Specifications of AM29DL800BT-90WBI

• Lead Free Status / Rohs Status: Not Compliant

Note: 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
program and erase operations in previously protected
sectors. Sector protection/unprotection can be imple-
mented 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 24 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. Pub-
lication number 21467 contains further details; contact
an AMD representative to request a copy.
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 protected
or unprotected. See the Autoselect Mode section for
details.
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-
14
Manufacturer ID: AMD
Device ID:
Am29DL800B
(Top Boot Block)
Device ID:
Am29DL800B
(Bottom Boot Block)
Sector Protection Verification
Description
Mode
Word
Word
Byte
Byte
IL
ID
Table 4. Am29DL800B Autoselect Codes (High Voltage Method)
, H = Logic High = V
on address pin A9 and OE#.
CE#
L
L
L
L
L
L
ID
on the RESET# pin
OE#
L
L
L
L
L
L
WE#
IH
H
H
H
H
H
H
, BA = Bank Address, SA = Sector Address, X = Don’t care.
D A T A
A18
A12
BA
BA
BA
SA
to
Am29DL800B
A11
A10
to
X
X
X
X
S H E E T
V
V
V
V
A9
SET# pin to V
formerly protected sectors can be programmed or
erased by selecting the sector addresses. Once V
removed from the RESET# pin, all the previously pro-
tected sectors are protected again. Figure 1 shows the
algorithm, and Figure 23 shows the timing diagrams,
for this feature.
Notes:
1. All protected sectors unprotected.
2. All previously protected sectors are protected once
Figure 1. Temporary Sector Unprotect Operation
ID
ID
ID
ID
again.
A8
A7
to
X
X
X
X
A6
L
L
L
L
ID
A5
A2
(11.5 V – 12.5 V). During this mode,
to
X
X
X
X
Unprotect Completed
Program Operations
Temporary Sector
Perform Erase or
A1
H
RESET# = V
L
L
L
RESET# = V
(Note 1)
(Note 2)
START
A0
H
H
L
L
21519C5 March 17, 2009
DQ15
DQ8
22h
22h
ID
IH
to
X
X
X
X
X
(unprotected)
(protected)
DQ7
DQ0
CBh
CBh
4Ah
4Ah
01h
01h
00h
to
ID
is