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AM29F016B-150EC View Datasheet(PDF) - Advanced Micro Devices

Part NameDescriptionManufacturer
AM29F016B-150EC 16 Megabit (2 M x 8-Bit) CMOS 5.0 Volt-only, Uniform Sector Flash Memory AMD
Advanced Micro Devices AMD
AM29F016B-150EC Datasheet PDF : 38 Pages
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PRELIMINARY
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 VID (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’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 VID. See
“Command Definitions” for details on using the autose-
lect mode.
Table 3. Am29F016B Autoselect Codes (High Voltage Method)
Description
Manufacturer ID:
AMD
Device ID:
Am29F016B
Sector Group
Protection
Verification
CE# OE# WE# A20-A18 A17-A10 A9 A8-A7 A6 A5-A2 A1 A0
L LH
X
X
VID
X
VIL
X
VIL VIL
L LH
X
X
VID
X
VIL
X
VIL VIH
Sector
L L H Group
X
VID
X
VIL
X
VIH VIL
Address
L = Logic Low = VIL, H = Logic High = VIH, 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 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 (VID) 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’s ExpressFlash™ Service. Con-
tact 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
SA0SA3
SGA1
0
0
1
SA4SA7
SGA2
0
1
0
SA8SA11
SGA3
0
1
1
SA12SA15
SGA4
1
0
0
SA16SA19
SGA5
1
0
1
SA20SA23
SGA6
1
1
0
SA24SA27
SGA7
1
1
1
SA28SA31
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 VID. During this mode,
formerly protected sector groups can be programmed
or erased by selecting the sector group addresses.
Once VID is removed from the RESET# pin, all the
previously protected sector groups are
protected again. Figure 1 shows the algorithm, and
the Temporary Sector Group Unprotect diagram (Fig-
ure 16) shows the timing waveforms, for this feature.
Am29F016B
11
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