AM29LV160M_07 Datasheet, PDF (17/63 Pages) Advanced Micro Devices – 16 Megabit (2 M x 8-Bit/1 M x 16-Bit) MirrorBit TM 3.0 Volt-only Boot Sector Flash Memory

Data Sheet
Autoselect Mode
The autoselect mode provides manufacturer and device 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
Table 4. In addition, when verifying sector protection, the sector address must
appear on the appropriate highest order address bits (see Table 2, on page 13
and Table 3, on page 14). Table 3 shows the remaining address bits that are don’t
care. When all necessary bits are set as required, the programming equipment
may then read the corresponding identifier code on DQ7-DQ0.
To access the autoselect codes in-system, the host system can issue the autose-
lect command via the command register, as shown in Table 10, on page 31 and
Table 11, on page 32. This method does not require V_ID. See “Command Defini-
tions” on page 23 for details on using the autoselect mode.
Table 4. Autoselect Codes (High Voltage Method)
Description
A19 A11
A8
A5
DQ8
Mod
to to
to
to
to
e CE# OE# WE# A12 A10 A9 A7 A6 A2 A1 A0 DQ15
DQ7
to
DQ0
Manufacturer ID
L
L
H
X X V_ID X
L
X
L
L
X
01h (AMD)
Device ID:
Word L
L
H
22h
C4h
Am29LV160M
X X V_ID X L X L H
(Top Boot Block) ^{Byte L}
L
H
X
C4h
Device ID:
Word L
L
H
22h
49h
Am29LV160M
(Bottom Boot
X X V_ID X L X L H
Byte L
L
H
X
49h
Block)
Sector Protection
Verification
X
01h
(protected)
L
L
H SA X V_ID X L X H L
X
00h
(unprotected)
Secured Silicon Sector
Indicator Bit (DQ7)
83h (factory
L
L
H
X X V_ID X H X
L
H
X
locked
03h (not
factory locked)
L = Logic Low = V_IL, H = Logic High = V_IH, SA = Sector Address, X = Don’t care.
Note: The autoselect codes may also be accessed in-system via command sequences. See Table 10, on page 31 and
Table 11, on page 32.
Sector Protection/Unprotection
The hardware sector protection feature disables both program and erase opera-
tions in any sector. The hardware sector unprotection feature re-enables both
program and erase operations in previously protected sectors.
The device is normally shipped with all sectors unprotected. However, the Ex-
pressFlash™ Service offers the option of programming and protecting sectors at
January 31, 2007 25974B5
Am29LV160M
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