AM29LV641DL120REI Spansion Inc., AM29LV641DL120REI Datasheet - Page 19

• Manufacturer Part Number: AM29LV641DL120REI
• Description: Flash Memory IC
• Manufacturer: Spansion Inc.

Specifications of AM29LV641DL120REI

• Memory Size: 64Mbit
• Memory Configuration: 4M X 16
• Ic Interface Type: Parallel
• Access Time: 120ns
• Memory Case Style: TSOP
• No. Of Pins: 48
• Operating Temperature Range: -40°C To +85°C
• Termination Type: SMD

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 Table 4). The hardware sector
group unprotection feature re-enables both program
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 22 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 Autoselect Mode
section for details.
18
ID
Am29LV640D/Am29LV641D
on the RE-
Note: All sector groups are 128 Kwords in size.
Table 4. Sector Group Protection/Unprotection
SA100–SA103
SA104–SA107
SA120–SA123
SA124–SA127
Sector Group
SA108–SA111
SA112–SA115
SA116–SA119
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–SA63
SA64–SA67
SA68–SA71
SA72–SA75
SA76–SA79
SA80–SA83
SA84–SA87
SA88–SA91
SA92–SA95
SA96–SA99
SA8–SA11
SA0–SA3
SA4–SA7
Address Table
September 20, 2002
A21–A17
00000
00001
00010
00100
00101
01000
01001
01010
10000
10001
10010
10100
10101
00011
00110
01011
01100
01101
10011
10110
11000
11001
11010
00111
01110
01111
10111
11011
11100
11101
11110
11111