AM29LV400BB-70EE Spansion Inc., AM29LV400BB-70EE Datasheet - Page 14

• Manufacturer Part Number: AM29LV400BB-70EE
• Manufacturer: Spansion Inc.

Specifications of AM29LV400BB-70EE

• Cell Type: NOR
• Density: 4Mb
• Access Time (max): 70ns
• Interface Type: Parallel
• Boot Type: Bottom
• Address Bus: 19/18Bit
• Operating Supply Voltage (typ): 3/3.3V
• Operating Temp Range: -55C to 125C
• Package Type: TSOP
• Program/erase Volt (typ): 2.7 to 3.6V
• Sync/async: Asynchronous
• Operating Temperature Classification: Military
• Operating Supply Voltage (min): 2.7V
• Operating Supply Voltage (max): 3.6V
• Word Size: 8/16Bit
• Number Of Words: 512K/256K
• Supply Current: 12mA
• Mounting: Surface Mount
• Pin Count: 48
• Lead Free Status / Rohs Status: Not Compliant

Autoselect Mode
The autoselect mode provides manufacturer and de-
vice identification, and sector protection verification,
through identifier codes output on DQ7–DQ0. This
mode is primarily intended for programming equip-
ment to automatically match a device to be pro-
grammed with its corresponding programming
algorithm. However, the autoselect codes can also be
accessed in-system through the command register.
When using programming equipment, the autoselect
mode requires V
A9. Address pins A6, A1, and A0 must be as shown in
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. 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 1 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.
12
Manufacturer ID: AMD
Device ID:
Am29LV400B
(Top Boot Block)
Device ID:
Am29LV400B
(Bottom Boot Block)
Sector Protection Verification
Description
IL
ID
, H = Logic High = V
(11.5 V to 12.5 V) on address pin
Mode
Word
Word
Byte
Byte
Table 4. Am29LV400B Autoselect Codes (High Voltage Method)
CE#
L
L
L
L
L
L
ID
on the RESET# pin
OE#
IH
L
L
L
L
L
L
, SA = Sector Address, X = Don’t care.
WE#
H
H
H
H
H
H
D A T A
A17
A12
SA
to
X
X
X
Am29LV400B
A11
A10
to
X
X
X
X
S H E E T
V
V
V
V
Table 4. In addition, when verifying sector protection,
the sector address must appear on the appropriate
highest order address bits (see Tables 2 and 3). Table
4 shows the remaining address bits that are don’t
care. When all necessary bits have been set as re-
quired, the programming equipment may then read the
corresponding identifier code on DQ7–DQ0.
To access the autoselect codes in-system, the host
system can issue the autoselect command via the
command register, as shown in Table 5. This method
does not require V
details on using the autoselect mode.
A9
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 20873 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 pro-
tected or unprotected. See “Autoselect Mode” for de-
tails.
ID
ID
ID
ID
A8
A7
to
X
X
X
X
A6
L
L
L
L
A5
A2
to
X
X
X
X
ID
. See “Command Definitions” for
ID
A1
H
L
L
L
on address pin A9 and OE#.
A0
H
H
L
L
21523D4 December 4, 2006
DQ15
DQ8
22h
22h
to
X
X
X
X
X
(unprotected)
(protected)
DQ7
DQ0
B9h
B9h
BAh
BAh
01h
01h
00h
to