AM29F080B-55EF Spansion Inc., AM29F080B-55EF Datasheet - Page 13

• Manufacturer Part Number: AM29F080B-55EF
• Description: IC, FLASH, 8MBIT, 55NS, TSOP-40
• Manufacturer: Spansion Inc.

Specifications of AM29F080B-55EF

• Memory Type: Flash
• Memory Size: 8Mbit
• Memory Configuration: 1M X 8
• Access Time: 55ns
• Supply Voltage Range: 4.75V To 5.25V
• Memory Case Style: TSOP
• No. Of Pins: 40
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Sector Group Protection/Unprotection
The hardware group sector protection feature dis-
ables both program and erase operations in any sec-
tor group. Each sector group consists of two adjacent
sectors. Table 3 shows how the sectors are grouped,
and the address range that each sector group con-
tains. The hardware sector group unprotection fea-
ture re-enables both program and erase operations in
previously protected sector groups.
Sector group protection/unprotection must be imple-
mented using programming equipment. The procedure
requires a high voltage (V
Temporary Sector Group Unprotect
This feature allows temporary unprotection of previ-
ously protected sector groups to change data in-sys-
tem. The Sector Group Unprotect mode is activated
by setting the RESET# pin to V
formerly protected sector groups can be programmed
or erased by selecting the sector group addresses.
Once V
p r e v i o u s l y
protected again. Figure 1 shows the algorithm, and
the Temporary Sector Group Unprotect diagram
shows the timing waveforms, for this feature.
November 11, 2009 21503G8
Sector
Group
SGA0
SGA1
SGA2
SGA3
SGA4
SGA5
SGA6
SGA7
ID
Table 3. Sector Group Addresses
is removed from the RESET# pin, all the
A19
0
0
0
0
1
1
1
1
p r o t e c t e d
A18
0
0
1
1
0
0
1
1
ID
) on address pin A9 and the
s e c t o r
A17
ID
0
1
0
1
0
1
0
1
. During this mode,
g r o u p s
SA10
SA12
SA14
SA0
SA2
SA4
SA6
SA8
Sectors
–
–
–
–
–
–
–
–
SA1
SA3
SA5
SA7
SA9
SA11
SA13
SA15
D A T A S H E E T
Am29F080B
a r e
control pins. Details on this method are provided in a
supplement, listed in publication number 19945. Con-
tact an AMD representative to obtain a copy of the ap-
propriate document.
The device is shipped with all sectors unprotected.
AMD offers the option of programming and protecting
sector groups 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 group is
protected or unprotected. See “Autoselect Mode” for
details.
Notes:
1. All protected sector groups unprotected.
2. All previously protected sector groups are protected
Figure 1. Temporary Sector Group Unprotect
once again.
Temporary Sector Group
Program Operations
Completed (Note 2)
Operation
Perform Erase or
RESET# = V
RESET# = V
Unprotect
(Note 1)
START
ID
IH
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