AM29LV641DH101RFEN Просмотр технического описания (PDF) - Advanced Micro Devices

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AM29LV641DH101RFEN

64 Megabit (4 M x 16-Bit) CMOS 3.0 Volt-only Uniform Sector Flash Memory with VersatileIO Control

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 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 VID on the RE-

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.

Table 4. Sector Group Protection/Unprotection

Address Table

Sector Group

SA0–SA3

SA4–SA7

SA8–SA11

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

SA100–SA103

SA104–SA107

SA108–SA111

SA112–SA115

SA116–SA119

SA120–SA123

SA124–SA127

A21–A17

00000

00001

00010

00011

00100

00101

00110

00111

01000

01001

01010

01011

01100

01101

01110

01111

10000

10001

10010

10011

10100

10101

10110

10111

11000

11001

11010

11011

11100

11101

11110

11111

Note: All sector groups are 128 Kwords in size.

18

Am29LV640D/Am29LV641D

September 20, 2002

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