am42dl1612d Meet Spansion Inc., am42dl1612d Datasheet - Page 82

• Manufacturer Part Number: am42dl1612d
• Description: 16 Mbit 2 M ? 8-bit/1 M ? 16-bit Cmos And 2 Mbit 128 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 to automatically match a
device to be programmed with its corresponding pro-
gramming 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 14. This method
does not require V
mand 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 Tables
8 and 9).
Table 8. Top Boot Sector/Sector Block Addresses
February 6, 2004
Sector / Sector
SA12-SA15
SA16-SA19
SA20-SA23
SA24-SA27
SA28-SA30
SA8-SA11
SA1-SA3
SA4-SA7
Block
SA31
SA32
SA33
SA34
SA35
SA36
SA0
for Protection/Unprotection
ID
00001XXX,
00010XXX,
001XXXXX
010XXXXX
011XXXXX
100XXXXX
101XXXXX
110XXXXX
11100XXX,
11101XXX,
00000XXX
00011XXX
11110XXX
11111000
11111001
11111010
11111011
11111100
11111101
. Refer to the Autoselect Com-
A19–A12
Sector / Sector Block Size
192 (3x64) Kbytes
256 (4x64) Kbytes
256 (4x64) Kbytes
256 (4x64) Kbytes
256 (4x64) Kbytes
256 (4x64) Kbytes
256 (4x64) Kbytes
192 (3x64) Kbytes
64 Kbytes
8 Kbytes
8 Kbytes
8 Kbytes
8 Kbytes
8 Kbytes
8 Kbytes
Am42DL16x2D
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. Sector protection and unprotection can be im-
plemented as follows.
Sector protection/unprotection requires V
SET# 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. Note that the sector unprotect
algorithm unprotects all sectors in parallel. All previ-
o u s l y p r o t e c t e d s e c t o r s mu s t b e i n d i v i d u a l l y
re-protected. To change data in protected sectors effi-
Sector / Sector
Sector / Sector
Table 9. Bottom Boot Sector/Sector Block
SA37-SA35
SA34-SA31
SA30-SA27
SA26-SA23
SA22-SA19
SA18-SA15
SA14-SA11
SA10-SA8
Block
Addresses for Protection/Unprotection
Block
SA37
SA38
SA38
SA7
SA6
SA5
SA4
SA3
SA2
SA1
SA0
11110XXX,
11101XXX,
110XXXXX
101XXXXX
100XXXXX
011XXXXX
010XXXXX
001XXXXX
00001XXX,
00010XXX,
11111XXX
11100XXX
00011XXX
11111110
11111111
00000111
00000110
00000101
00000100
00000011
00000010
00000001
00000000
A19–A12
A19–A12
Sector / Sector Block Size
Sector / Sector Block Size
192 (3x64) Kbytes
256 (4x64) Kbytes
256 (4x64) Kbytes
256 (4x64) Kbytes
256 (4x64) Kbytes
256 (4x64) Kbytes
256 (4x64) Kbytes
192 (3x64) Kbytes
64 Kbytes
8 Kbytes
8 Kbytes
8 Kbytes
8 Kbytes
8 Kbytes
8 Kbytes
8 Kbytes
8 Kbytes
8 Kbytes
8 Kbytes
ID
on the RE-
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