AM29F800BT-55SF Spansion Inc., AM29F800BT-55SF Datasheet - Page 15

• Manufacturer Part Number: AM29F800BT-55SF
• Description: IC, FLASH, 8MBIT, 55NS, SOIC-44
• Manufacturer: Spansion Inc.

Specifications of AM29F800BT-55SF

• Memory Type: Flash
• Memory Size: 8Mbit
• Memory Configuration: 1M X 8 / 512K X 16
• Access Time: 55ns
• Supply Voltage Range: 4.5V To 5.5V
• Memory Case Style: SOIC
• No. Of Pins: 44
• 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 pro-
tected sectors.
Sector protection/unprotection must be implemented
using programming equipment. The procedure re-
quires a high voltage (V
control pins. Details on this method are provided in a
supplement, publication number 20374. Contact an
AMD representative to obtain a copy of the appropriate
document.
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 “Autoselect Mode” 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
RESET# pin to V
tected sectors can be programmed or erased by se-
lecting the sector addresses. Once V
from the RESET# pin, all the previously protected
November 2, 2006 21504E5
Manufacturer ID: AMD
Device ID:
Am29F800B
(Top Boot Block)
Device ID:
Am29F800B
(Bottom Boot Block)
Sector Protection Verification
Description
IL
, H = Logic High = V
ID
. During this mode, formerly pro-
Mode
Word
Word
Byte
Byte
Table 4. Am29F800B Autoselect Codes (High Voltage Method)
ID
) on address pin A9 and the
CE#
L
L
L
L
L
L
OE#
IH
L
L
L
L
L
L
, SA = Sector Address, X = Don’t care.
ID
WE#
is removed
H
H
H
H
H
H
D A T A S H E E T
A18
A12
SA
to
X
X
X
Am29F800B
A11
A10
to
X
X
X
X
V
V
V
V
A9
sectors are protected again. Figure 1 shows the algo-
rithm, and the Temporary Sector Unprotect diagram
shows the timing waveforms, 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
A5
A2
to
X
X
X
X
Program Operations
Completed (Note 2)
Temporary Sector
Perform Erase or
A1
H
L
L
L
RESET# = V
RESET# = V
Unprotect
(Note 1)
START
A0
H
H
L
L
DQ15
DQ8
22h
22h
ID
IH
to
X
X
X
X
X
(unprotected)
(protected)
DQ7
DQ0
D6h
D6h
01h
58h
58h
01h
00h
to
13