參數(shù)資料
型號： AM45DL6408G
英文描述： 250NS, CERDIP, 883C; LEV B COMPLIANT(EEPROM)
中文描述： 64兆位（8米× 8位/ 4米× 16位）CMOS和8兆位（1 M中的x 8-Bit/512畝x 16位）（初步）
文件頁數(shù)： 21/64頁
文件大小： 1191K
代理商： AM45DL6408G
20
Am45DL32x8G
August 28, 2002
P R E L I M I N A R Y
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
10
and
11
).
The hardware sector protection feature disables both
program and erase operations in any sector. The hard-
ware sector unprotection feature re-enables both pro-
gram and erase operations in previously protected
sectors. Sector protection/unprotection can be imple-
mented via two methods.
Table 10.
Addresses for Protection/Unprotection
Top Boot Sector/Sector Block
Table 11.
Addresses for Protection/Unprotection
Bottom Boot Sector/Sector Block
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 Unprotect
”
.
Sector Protection/Unprotection requires V
ID
on the
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. Note that the sector unprotect
algorithm unprotects all sectors in parallel. All previ-
Sector
A20
–
A12
Sector/
Sector Block Size
SA0
000000XXX
64 Kbytes
SA1
–
SA3
000001XXX,
000010XXX
000011XXX
192 (3x64) Kbytes
SA4
–
SA7
0001XXXXX
256 (4x64) Kbytes
SA8
–
SA11
0010XXXXX
256 (4x64) Kbytes
SA12
–
SA15
0011XXXXX
256 (4x64) Kbytes
SA16
–
SA19
0100XXXXX
256 (4x64) Kbytes
SA20
–
SA23
0101XXXXX
256 (4x64) Kbytes
SA24
–
SA27
0110XXXXX
256 (4x64) Kbytes
SA28
–
SA31
0111XXXXX
256 (4x64) Kbytes
SA32
–
SA35
1000XXXXX
256 (4x64) Kbytes
SA36
–
SA39
1001XXXXX
256 (4x64) Kbytes
SA40
–
SA43
1010XXXXX
256 (4x64) Kbytes
SA44
–
SA47
1011XXXXX
256 (4x64) Kbytes
SA48
–
SA51
1100XXXXX
256 (4x64) Kbytes
SA52
–
SA55
1101XXXXX
256 (4x64) Kbytes
SA56
–
SA59
1110XXXXX
256 (4x64) Kbytes
SA60
–
SA62
111100XXX,
111101XXX,
111110XXX
192 (4x64) Kbytes
SA63
111111000
8 Kbytes
SA64
111111001
8 Kbytes
SA65
111111010
8 Kbytes
SA66
111111011
8 Kbytes
SA67
111111100
8 Kbytes
SA68
111111101
8 Kbytes
SA69
111111110
8 Kbytes
SA70
111111111
8 Kbytes
Sector
A20
–
A12
Sector/Sector Block
Size
SA70
111111XXX
64 Kbytes
SA69-SA67
111110XXX,
111101XXX,
111100XXX
192 (3x64) Kbytes
SA66-SA63
1110XXXXX
256 (4x64) Kbytes
SA62-SA59
1101XXXXX
256 (4x64) Kbytes
SA58-SA55
1100XXXXX
256 (4x64) Kbytes
SA54-SA51
1011XXXXX
256 (4x64) Kbytes
SA50-SA47
1010XXXXX
256 (4x64) Kbytes
SA46-SA43
1001XXXXX
256 (4x64) Kbytes
SA42-SA39
1000XXXXX
256 (4x64) Kbytes
SA38-SA35
0111XXXXX
256 (4x64) Kbytes
SA34-SA31
0110XXXXX
256 (4x64) Kbytes
SA30-SA27
0101XXXXX
256 (4x64) Kbytes
SA26-SA23
0100XXXXX
256 (4x64) Kbytes
SA22
–
SA19
0011XXXXX
256 (4x64) Kbytes
SA18-SA15
0010XXXXX
256 (4x64) Kbytes
SA14-SA11
0001XXXXX
256 (4x64) Kbytes
SA10-SA8
000011XXX,
000010XXX,
000001XXX
192 (3x64) Kbytes
SA7
000000111
8 Kbytes
SA6
000000110
8 Kbytes
SA5
000000101
8 Kbytes
SA4
000000100
8 Kbytes
SA3
000000011
8 Kbytes
SA2
000000010
8 Kbytes
SA1
000000001
8 Kbytes
SA0
000000000
8 Kbytes
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