AM29BL802CB-120RZE AMD [Advanced Micro Devices], AM29BL802CB-120RZE Datasheet - Page 14

• Manufacturer Part Number: AM29BL802CB-120RZE
• Description: 8 Megabit (512 K x 16-Bit) CMOS 3.0 Volt-only Burst Mode Flash Memory
• Manufacturer: AMD [Advanced Micro Devices]

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 V
A9. Address pins A6, A1, and A0 must be as shown in
L = Logic Low = V
Note: The autoselect codes may also be accessed in-system via command sequences. See Table 4.
Sector Protection/Unprotection
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.
It is possible to determine whether a sector is protected
or unprotected. See “Autoselect Mode” for details.
Sector protection/unprotection can be implemented via
two methods.
12
Manufacturer ID: AMD
Device ID:
Am29BL802CB
(Bottom Boot Block)
Sector Protection Verification
Burst Mode Status
Description
IL
ID
, H = Logic High = V
(11.5 V to 12.5 V) on address pin
Table 3. Am29BL802C Autoselect Codes (High Voltage Method)
CE#
L
L
L
L
OE#
IH
L
L
L
L
, SA = Sector Address, X = Don’t care.
WE#
H
H
H
H
D A T A
A18
A12
SA
to
Am29BL802C
X
X
X
A11
A10
to
X
X
X
X
S H E E T
Table 1. In addition, when verifying sector protection,
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.
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
does not require V
details on using the autoselect mode.
The primary method requires V
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 alternate method intended only for programming
equipment requires V
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-
l i c a t i o n
www.spansion.com.
V
V
V
V
A9
ID
ID
ID
ID
A8
A7
to
X
X
X
X
A6
n u m b e r
L
L
L
L
A5
A2
to
X
X
X
X
ID
. See “Command Definitions” for
ID
A1
H
H
L
L
on address pin A9 and OE#.
22371C7 November 3, 2006
2 2 3 7 2 ,
A0
H
H
L
L
ID
on the RESET# pin
0000h (unprotected)
0001h (protected)
(non-burst mode)
a v a i l a b l e
(burst mode)
0001h
0081h
0000h
0001h
DQ7
DQ0
to
o n