D161DB70PI datasheet(18/57 Pages) AMD

18 / 57 page

Am29DL16xD

May 26, 2004

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

for Protection/Unprotection

Table 9.

Bottom Boot Sector/Sector Block

Addresses for Protection/Unprotection

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 via two methods.

The primary method requires V

ID on the RESET# pin

only, and can be implemented either in-system or via

programming equipment. Figure 2 shows the algo-

rithms and Figure 25 shows the timing diagram. This

method uses standard microprocessor bus cycle tim-

ing. For sector unprotect, all unprotected sectors must

first be protected prior to the first sector unprotect

write cycle.

The sector unprotect algorithm unprotects all sectors

in parallel. All previously protected sectors must be in-

dividually re-protected. To change data in protected

sectors efficiently, the temporary sector unprotect

function is available. See “Temporary Sector/Sector

Block Unprotect”.

The alternate method intended only for programming

equipment requires V

ID on address pin A9 and OE#.

This method is compatible with programmer routines

written for earlier 3.0 volt-only AMD flash devices.

Publication number 22243 contains further details;

contact an AMD representative to request a copy.

The device is shipped with all sectors unprotected.

AMD offers the option of programming and protecting

sectors at its factory prior to shipping the device

Sector / Sector

Block

A19–A12

Sector / Sector Block Size

SA0

00000XXX

64 Kbytes

SA1-SA3

00001XXX,

00010XXX,

00011XXX

192 (3x64) Kbytes

SA4-SA7

001XXXXX

256 (4x64) Kbytes

SA8-SA11

010XXXXX

256 (4x64) Kbytes

SA12-SA15

011XXXXX

256 (4x64) Kbytes

SA16-SA19

100XXXXX

256 (4x64) Kbytes

SA20-SA23

101XXXXX

256 (4x64) Kbytes

SA24-SA27

110XXXXX

256 (4x64) Kbytes

SA28-SA30

11100XXX,

11101XXX,

11110XXX

192 (3x64) Kbytes

SA31

11111000

8 Kbytes

SA32

11111001

8 Kbytes

SA33

11111010

8 Kbytes

SA34

11111011

8 Kbytes

SA35

11111100

8 Kbytes

SA36

11111101

8 Kbytes

SA37

11111110

8 Kbytes

SA38

11111111

8 Kbytes

Sector / Sector

Block

A19–A12

Sector / Sector Block Size

SA38

11111XXX

64 Kbytes

SA37-SA35

11110XXX,

11101XXX,

11100XXX

192 (3x64) Kbytes

SA34-SA31

110XXXXX

256 (4x64) Kbytes

SA30-SA27

101XXXXX

256 (4x64) Kbytes

SA26-SA23

100XXXXX

256 (4x64) Kbytes

SA22-SA19

011XXXXX

256 (4x64) Kbytes

SA18-SA15

010XXXXX

256 (4x64) Kbytes

SA14-SA11

001XXXXX

256 (4x64) Kbytes

SA10-SA8

00001XXX,

00010XXX,

00011XXX

192 (3x64) Kbytes

SA7

00000111

8 Kbytes

SA6

00000110

8 Kbytes

SA5

00000101

8 Kbytes

SA4

00000100

8 Kbytes

SA3

00000011

8 Kbytes

SA2

00000010

8 Kbytes

SA1

00000001

8 Kbytes

SA0

00000000

8 Kbytes

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