AM29F016D_06 Datasheet, PDF (13/43 Pages) Advanced Micro Devices – 16 Megabit (2 M x 8-Bit) CMOS 5.0 Volt-only, Uniform Sector Flash Memory

DATA SHEET
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 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
address 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’t care. When all
necessary bits have been set as required, the program-
ming 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 the Command Defini-
tions table. This method does not require V_ID. See
“Command Definitions” for details on using the autose-
lect mode.
Table 3. Am29F016D Autoselect Codes (High Voltage Method)
Description
Manufacturer ID:
AMD
Device ID:
Am29F016D
Sector Group
Protection
Verification
CE# OE# WE# A20-A18 A17-A10 A9 A8-A7 A6 A5-A2 A1 A0
L LH
X
X
V_ID
X
V_IL
X
V_IL V_IL
L LH
X
X
V_ID
X
V_IL
X
V_IL V_IH
Sector
L L H Group
X
V_ID
X
V_IL
X
V_IH V_IL
Address
L = Logic Low = V_IL, H = Logic High = V_IH, SA = Sector Address, X = Don’t care.
DQ7-DQ0
01h
ADh
01h (protected)
00h (unprotected)
Sector Group Protection/Unprotection
The hardware sector group protection feature dis-
ables both program and erase operations in any
sector group. Each sector group consists of four adja-
cent sectors. Table 4 shows how the sectors are
grouped, and the address range that each sector
group contains. The hardware sector group unprotec-
tion feature 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 23922. Contact an
AMD representative to obtain a copy of the appropriate
document. Note that the sector group protection and
unprotection scheme differs from that used with the
previous versions of this device, namely the
Am29F016B and Am29F016.
The device is shipped with all sector groups unpro-
tected. 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.
Table 4. Sector Group Addresses
Sector
Group
A20
A19
A18
Sectors
SGA0
0
0
0
SA0–SA3
SGA1
0
0
1
SA4–SA7
SGA2
0
1
0
SA8–SA11
SGA3
0
1
1
SA12–SA15
SGA4
1
0
0
SA16–SA19
SGA5
1
0
1
SA20–SA23
SGA6
1
1
0
SA24–SA27
SGA7
1
1
1
SA28–SA31
Temporary Sector Group Unprotect
This feature allows temporary unprotection of previ-
ously protected sector groups to change data
in-system. The Sector Group Unprotect mode is acti-
vated by setting the RESET# pin to V_ID. During this
mode, formerly protected sector groups can be pro-
grammed or erased by selecting the sector group
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Am29F016D
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