L320MT90QI Advanced Micro Devices, L320MT90QI Datasheet - Page 17

• Manufacturer Part Number: L320MT90QI
• Description: 32 Megabit 2 M X 16-bit/4 M X 8-bit Mirrorbit 3.0 Volt-only Boot Sector Flash Memory - Advanced Micro Devices
• Manufacturer: Advanced Micro Devices

Sector Group Protection and
Unprotection
The hardware sector group protection feature disables
both program and erase operations in any sector
group. In this device, a sector group consists of four
adjacent sectors that are protected or unprotected at
the same time (see Tables
sector group unprotection feature re-enables both pro-
gram and erase operations in previously protected
sector groups. Sector group protection/unprotection
can be implemented via two methods.
Sector protection/unprotection requires V
SET# pin only, and can be implemented either in-sys-
tem or via programming equipment. Figure 2 shows
the algorithms and Figure 24 shows the timing dia-
gram. This method uses standard microprocessor bus
cycle timing. For sector group unprotect, all unpro-
tected sector groups must first be protected prior to
the first sector group unprotect write cycle.
The device is shipped with all sector groups unpro-
tected. AMD offers the option of programming and
protecting sector groups 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 group is
protected or unprotected. See the
section for details.
May 16, 2003
SA32–SA35
SA36–SA39
SA40–SA43
SA44–SA47
SA48–SA51
SA12-SA15
SA16-SA19
SA20-SA23
SA24-SA27
SA28-SA31
SA52-SA55
SA56-SA59
SA60-SA62
SA8-SA11
SA0-SA3
SA4-SA7
Sector
SA63
SA64
SA65
Table 5. Am29LV320MT Top Boot
Sector Protection
1000XXXXXh,
0000XXXXXh
0001XXXXXh
0010XXXXXh
0011XXXXXh
0100XXXXXh
0101XXXXXh
0110XXXXXh
1001XXXXXh
1010XXXXXh
1011XXXXXh
1100XXXXXh
1101XXXXXh
0111XXXXXh
1110XXXXXh
111100XXXh
111101XXXh
111110XXXh
111111000h
111111001h
111111010h
A20–A12
5
and 6). The hardware
Sector Block Size
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
256 (4x64) Kbytes
192 (3x64) Kbytes
Autoselect Mode
8 Kbytes
8 Kbytes
8 Kbytes
Sector/
ID
on the RE-
D A T A S H E E T
Am29LV320MT/B
Write Protect (WP#)
The Write Protect function provides a hardware
method of protecting the top two or bottom two sectors
without using V
vided by the WP#/ACC input.
If the system asserts V
vice disables program and erase functions in the first
or last sector independently of whether those sectors
were protected or unprotected using the method de-
scribed in “Sector Group Protection and Unprotection”.
Note that if WP#/ACC is at V
the standby mode, the maximum input load current is
increased. See the table in “DC Characteristics”.
SA15–SA18
SA19–SA22
SA23–SA26
SA55–SA58
SA59–SA62
SA63–SA66
SA67–SA70
SA11–SA14
SA27-SA30
SA31-SA34
SA35-SA38
SA39-SA42
SA43-SA46
SA47-SA50
SA51-SA54
SA8–SA10
Sector
Sector
SA66
SA67
SA68
SA69
SA70
Table 6. Am29LV320MB Bottom Boot
SA0
SA1
SA2
SA3
SA4
SA5
SA6
SA7
ID
Sector Protection
. WP# is one of two functions pro-
000001XXXh,
000010XXXh,
000011XXXh,
0001XXXXXh
0010XXXXXh
0011XXXXXh
0100XXXXXh
0101XXXXXh
0110XXXXXh
1000XXXXXh
1001XXXXXh
1010XXXXXh
1011XXXXXh
1100XXXXXh
1101XXXXXh
0111XXXXXh
1110XXXXXh
1111XXXXXh
000000000h
000000001h
000000010h
000000011h
000000100h
000000101h
000000110h
000000111h
111111011h
111111100h
111111101h
111111110h
111111111h
A20–A12
A20–A12
IL
on the WP#/ACC pin, the de-
IL
when the device is in
Sector Block Size
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
256 (4x64) Kbytes
8 Kbytes
8 Kbytes
8 Kbytes
8 Kbytes
8 Kbytes
8 Kbytes
8 Kbytes
8 Kbytes
8 Kbytes
8 Kbytes
8 Kbytes
8 Kbytes
8 Kbytes
Sector/
Sector/
17