D A T A S H E E T
Table 1. In addition, when verifying sector protection,
Autoselect Mode
the sector address must appear on the appropriate
highest order address bits (see Table 2). Table 1 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.
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.
To access the autoselect codes in-system, the host
system can issue the autoselect command via the
command register, as shown in Table 4. This method
When using programming equipment, the autoselect
mode requires V (11.5 V to 12.5 V) on address pin
does not require V . See “Command Definitions” for
ID
ID
details on using the autoselect mode.
A9. Address pins A6, A1, and A0 must be as shown in
Table 3. Am29BL802C Autoselect Codes (High Voltage Method)
A18 A11
to to
CE# OE# WE# A12 A10 A9
A8
to
A7
A5
to
A2
DQ7
to
DQ0
Description
A6
A1
A0
Manufacturer ID: AMD
L
L
H
X
X
VID
X
X
L
X
X
L
L
0001h
0081h
Device ID:
Am29BL802CB
(Bottom Boot Block)
L
L
H
X
X
VID
L
L
L
H
L
0001h (protected)
Sector Protection Verification
Burst Mode Status
L
L
L
L
H
H
SA
X
X
X
VID
X
X
X
X
H
0000h (unprotected)
0000h
(non-burst mode)
0001h
VID
L
H
H
(burst mode)
L = Logic Low = VIL, H = Logic High = VIH, SA = Sector Address, X = Don’t care.
Note: The autoselect codes may also be accessed in-system via command sequences. See Table 4.
The primary method requires V on the RESET# pin
Sector Protection/Unprotection
ID
only, and can be implemented either in-system or via
programming equipment. Figure 1 shows the algo-
rithms and Figure 24 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 hardware sector protection feature disables both
program and erase operations in any sector. The hard-
ware sector unprotection feature re-enables both program
and erase operations in previously protected sectors.
The device is shipped with all sectors unprotected.
AMD offers the option of programming and protecting
sectors at its factory prior to shipping the device
through AMD’s ExpressFlash™ Service. Contact an
AMD representative for details.
The alternate method intended only for programming
equipment requires V on address pin A9 and OE#.
ID
This method is compatible with programmer routines
written for earlier 3.0 volt-only AMD flash devices. De-
tails on this method are provided in a supplement, pub-
It is possible to determine whether a sector is protected
or unprotected. See “Autoselect Mode” for details.
lication
www.spansion.com.
number
22372,
available
on
Sector protection/unprotection can be implemented via
two methods.
12
Am29BL802C
22371C7 November 3, 2006
SPANSION [ SPANSION ]
