COTS PEM
BOOT SECTOR FLASH
Austin Semiconductor, Inc.
AS29LV016
AUTOSELECT MODE
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.
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.
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.
When using programming equipment, the autoselect mode
requires VID (11.5 V to 12.5 V) on address pinA9.Address
pins A6, A1, and A0 must be as shown in Table 4 below.
Table 4: AS29LV016 Autoselect Codes (High Voltage Method)
A19 to A11 to
A8 to
A7
A5 to A3 to
DQ8 to
DQ15
Description
Mode CE#
OE# WE#
A9
A6
A1
A0
DQ7 to DQ0
A12
A10
A4
A2
Manufacturer ID: Spansion
Device ID: S29AL016D
(Top Boot Block)
VID
VID
L
L
L
L
L
L
H
H
H
H
H
X
X
X
X
X
X
X
X
X
X
X
X
L
L
X
L
L
L
L
X
22h
X
01h
Word
Byte
Word
Byte
L
L
L
L
C4h
C4h
X
L
H
Device ID: S29AL016D
(Bottom Boot Block)
22h
X
49h
VID
VID
X
X
L
L
X
X
L
L
L
H
L
49h
X
01h (protected)
00h (unprotected)
Sector Protection Verification
L
L
H
SA
X
H
X
L= Logic Low = V IL , H=Logic High=V IH , SA = Sector Address, ꢁ=Donꢂt Care
Note: The autoselect codes may also be accessed in-system via command sequences. See Table 9 on page 21.
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 primary method requires VID on the RESET# pin only,
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 device is shipped with all sectors unprotected.
It is possible to determine whether a sector is protected
or unprotected. SeeAutoselect Mode above for details.
The alternate method intended only for programming
equipment requires VID on address pin A9 and OE#.
Sector protection/unprotection can be implemented via
two methods.
Austin Semiconductor, Inc. reserves the right to change products or specifications without notice.
AS29LV016
Rev. 2.1 10/08
11
AUSTIN [ AUSTIN SEMICONDUCTOR ]
