as29lv016brg-90/xt Austin Semiconductor, Inc., as29lv016brg-90/xt Datasheet - Page 11

• Manufacturer Part Number: as29lv016brg-90/xt
• Description: 16 Megabit 2m X 8-bit / 1m X 16-bit Cmos 3.0 Volt-only Boot Sector Flash Memory
• Manufacturer: Austin Semiconductor, Inc.

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
pins A6, A1, and A0 must be as shown in Table 4 below.
SECTOR PROTECTION / UNPROTECTION
The hardware sector protection feature disables both
program and erase operations in any sector. The hardware
sector unprotection feature re-enables both program and
erase operations in previously protected sectors.
The device is shipped with all sectors unprotected.
It is possible to determine whether a sector is protected
or unprotected. See Autoselect Mode above for details.
Sector protection/unprotection can be implemented via
two methods.
Table 4: AS29LV016 Autoselect Codes (High Voltage Method)
Manufacturer ID: Spansion
Device ID: S29AL016D
(Top Boot Block)
Device ID: S29AL016D
(Bottom Boot Block)
Sector Protection Verification
L= Logic Low = V
Note: The autoselect codes may also be accessed in-system via command sequences. See Table 9 on page 21.
AS29LV016
Rev. 2.0 06/06
Description
ID
(11.5 V to 12.5 V) on address pin A9. Address
IL
, H=Logic High=V
Mode
Word
Word
Byte
Byte
IH
CE#
, SA = Sector Address, X=Don't Care
Austin Semiconductor, Inc.
L
L
L
L
L
L
OE#
L
L
L
L
L
L
WE#
H
H
H
H
H
H
A19 to
A12
SA
X
X
X
X
X
A11 to
A10
X
X
X
X
X
X
V
V
V
V
11
A9
ID
ID
ID
ID
In addition, when verifying sector protection, the sector
address must appear on the appropriate highest order
address bits (see Table 2 on page 9 and Table 3 on
page 10). Table 4, immediately below, shows the
remaining address bits that are don’t care. When all
necessary bits have been 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 autoselect command via the
command register, as shown in Table 9 on page 21. This
method does not require VID. See Command Definitions
on page 17 for details on using the autoselect mode.
The primary method requires V
and can be implemented either in-system or via
programming equipment. Figure 2, on page 13 shows the
algorithms and Figure 22, on page 36 shows the timing
diagram. This method uses standard microprocessor bus
cycle timing. For sector unprotect, all unprotected sectors
must first be protected prior to the first sector unprotect
write cycle.
The alternate method intended only for programming
equipment requires V
A8 to
A7
X
X
X
X
Austin Semiconductor, Inc. reserves the right to change products or specifications without notice.
A6
L
L
L
L
BOO
BOO
BOOT SECT
BOO
BOO
A5 to
A4
X
X
X
X
T SECT
T SECT
T SECT
T SECTOR FLASH
A3 to
A2
L
L
L
L
ID
on address pin A9 and OE#.
A1
H
L
L
L
ID
A0
on the RESET# pin only,
H
H
L
L
CO
CO
CO
COTS PEM
CO
OR FLASH
OR FLASH
OR FLASH
OR FLASH
DQ8 to
AS29LV016
DQ15
22h
22h
X
X
X
X
X
TS PEM
TS PEM
TS PEM
TS PEM
00h (unprotected)
01h (protected)
DQ7 to DQ0
C4h
C4h
01h
49h
49h