AM29DL16XC datasheet(14/51 Pages) AMD

14 / 51 page

Am29DL16xC

P R E L I M I NARY

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 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

through AMD’s ExpressFlash™ Service. Contact an

AMD representative for details.

It is possible to determine whether a sector is pro-

tected or unprotected. See the Autoselect Mode

section for details.

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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