am41dl3208gt85it Meet Spansion Inc., am41dl3208gt85it Datasheet - Page 22

• Manufacturer Part Number: am41dl3208gt85it
• Description: 32 Mbit 4 M ? 8-bit/2 M ? 16-bit Cmos 3.0 Volt-only, Simultaneous Operation Flash Memory And 8 Mbit 1 M ? 8-bit/512 K ? 16-bit Static Ram Preliminary
• Manufacturer: Meet Spansion Inc.

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 equip-
m e n t t o a u t o m a t i c a l l y m a t c h a d e v i c e t o b e
programmed with its corresponding programming al-
gorithm. 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 Tables 15 and 16. This
method does not require V
Command Sequence section for more information.
Sector/Sector Block Protection and
Unprotection
(Note: For the following discussion, the term “sector”
applies to both sectors and sector blocks. A sector
block consists of two or more adjacent sectors that are
protected or unprotected at the same time (see Table
10).
February 13, 2002
SA12–SA15
SA16–SA19
SA20–SA23
SA24–SA27
SA28–SA31
SA32–SA35
SA36–SA39
SA40–SA43
SA44–SA47
SA48–SA51
SA52–SA55
SA56–SA59
SA60–SA62
SA8–SA11
SA1–SA3
SA4–SA7
Table 10. Top Boot Sector/Sector Block
Sector
SA63
SA64
SA65
SA66
Addresses for Protection/Unprotection
SA0
000001XXX,
0001XXXXX
0010XXXXX
0100XXXXX
0101XXXXX
1000XXXXX
1001XXXXX
1010XXXXX
0011XXXXX
0110XXXXX
0111XXXXX
1011XXXXX
1100XXXXX
1101XXXXX
1110XXXXX
111100XXX,
111101XXX,
000000XXX
000010XXX
000011XXX
111110XXX
111111000
111111001
111111010
111111011
A20–A12
ID
. Refer to the Autoselect
Sector Block Size
192 (3x64) Kbytes
256 (4x64) Kbytes
256 (4x64) Kbytes
256 (4x64) Kbytes
256 (4x64) Kbytes
256 (4x64) Kbytes
256 (4x64) Kbytes
256 (4x64) Kbytes
256 (4x64) Kbytes
256 (4x64) Kbytes
256 (4x64) Kbytes
256 (4x64) Kbytes
256 (4x64) Kbytes
256 (4x64) Kbytes
256 (4x64) Kbytes
192 (4x64) Kbytes
64 Kbytes
8 Kbytes
8 Kbytes
8 Kbytes
8 Kbytes
Sector/
P R E L I M I N A R Y
Am41DL3208G
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. Note that the sector unprotect algorithm un-
protects all sectors in parallel. All previously protected
sectors must be individually re-protected. To change
data in protected sectors efficiently, the temporary
sector un protect function is available. See “Temporary
Sector/Sector Block Unprotect”.
Sector protection and unprotection can be imple-
mented as follows.
Sector protection and unprotection requires V
RESET# pin only, and can be implemented either
in-system or via programming equipment. Figure 2
shows the algorithms and Figure 26 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 pro-
tected or unprotected. See the Autoselect Mode
section for details.
Write Protect (WP#)
The Write Protect function provides a hardware
method of protecting certain boot sectors without
using V
WP#/ACC pin.
If the system asserts V
vice disables program and erase functions in the two
“outermost” 8 Kbyte boot sectors independently of
whether those sectors were protected or unprotected
using the method described in “Sector/Sector Block
Protection and Unprotection”. The two outermost 8
Kbyte boot sectors are the two sectors containing the
lowest addresses in a top-boot-configured device, or
the two sectors containing the highest addresses in a
top-boot-configured device.
If the system asserts V
vice reverts to whether the two outermost 8 Kbyte boot
sectors were last set to be protected or unprotected.
That is, sector protection or unprotection for these two
sectors depends on whether they were last protected
or unprotected using the method described in “Sec-
tor/Sector Block Protection and Unprotection”.
Sector
SA67
SA68
SA69
SA70
ID
. This function is one of two provided by the
111111100
111111101
111111110
111111111
A20–A12
IL
IH
on the WP#/ACC pin, the de-
on the WP#/ACC pin, the de-
Sector Block Size
8 Kbytes
8 Kbytes
8 Kbytes
8 Kbytes
Sector/
ID
on the
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