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Am29F016B-70EE Datasheet

  • Am29F016B-70EE

  • Advanced Micro Devices [16 Megabit (2 M x 8-Bit) CMOS 5.0 V...

  • AMD

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P R E L I M I N A R Y
Autoselect Mode
The autoselect mode provides manufacturer and de-
vice identification, and sector protection verification,
through identifier codes output on DQ7鈥揇Q0. This
mode is primarily intended for programming equipment
to automatically match a device to be programmed 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
ID
(11.5 V to 12.5 V) on address pin
A9. Address pins A6, A1, and A0 must be as shown in
Autoselect Codes (High Voltage Method) table. In addi-
tion, when verifying sector protection, the sector ad-
dress must appear on the appropriate highest order
address bits. Refer to the corresponding Sector Ad-
dress Tables. The Command Definitions table shows
the remaining address bits that are don鈥檛 care. When all
necessary bits have been set as required, the program-
ming equipment may then read the corresponding
identifier code on DQ7鈥揇Q0.
To access the autoselect codes in-system, the host
system can issue the autoselect command via the
command register, as shown in the Command Defini-
tions table. This method does not require V
ID
. See
鈥淐ommand Definitions鈥?for details on using the autose-
lect mode.
Table 3.
Description
Manufacturer ID:
AMD
Device ID:
Am29F016B
Sector Group
Protection
Verification
Am29F016B Autoselect Codes (High Voltage Method)
A9
V
ID
V
ID
A8-A7
X
X
A6
V
IL
V
IL
A5-A2
X
X
A1
V
IL
V
IL
A0
V
IL
V
IH
DQ7-DQ0
01h
ADh
01h (protected)
X
V
ID
X
V
IL
X
V
IH
V
IL
00h (unprotected)
CE# OE# WE# A20-A18 A17-A10
L
L
L
L
H
H
X
X
Sector
Group
Address
X
X
L
L
H
L = Logic Low = V
IL
, H = Logic High = V
IH
, SA = Sector Address, X = Don鈥檛 care.
Sector Group Protection/Unprotection
The hardware sector group protection feature dis-
ables both program and erase operations in any sec-
tor group. Each sector group consists of four adjacent
sectors. Table 4 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
ID
) on address pin A9 and the
control pins. Details on this method are provided in a
supplement, publication number 19613. Contact an
AMD representative to obtain a copy of the appropriate
document.
The device is shipped with all sector groups unpro-
tected. AMD offers the option of programming and pro-
tecting sector groups at its factory prior to shipping the
device through AMD鈥檚 ExpressFlash鈩?Service. Con-
tact an AMD representative for details.
It is possible to determine whether a sector group is
protected or unprotected. See 鈥淎utoselect Mode鈥?for
details.
Table 4.
Sector
Group
SGA0
SGA1
SGA2
SGA3
SGA4
SGA5
SGA6
SGA7
A20
0
0
0
0
1
1
1
1
Sector Group Addresses
A19
0
0
1
1
0
0
1
1
A18
0
1
0
1
0
1
0
1
Sectors
SA0
鈥?/div>
SA3
SA4
鈥?/div>
SA7
SA8
鈥?/div>
SA11
SA12
鈥?/div>
SA15
SA16
鈥?/div>
SA19
SA20
鈥?/div>
SA23
SA24
鈥?/div>
SA27
SA28
鈥?/div>
SA31
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
ID
. During this mode,
formerly protected sector groups can be programmed
or erased by selecting the sector group addresses.
Once V
ID
is removed from the RESET# pin, all the
p r ev i ou s ly p ro t ec te d se ct o r gr o u p s a r e
protected again. Figure 1 shows the algorithm, and
the Temporary Sector Group Unprotect diagram (Fig-
ure 16) shows the timing waveforms, for this feature.
11
Am29F016B

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