AM49DL640BH56IS SPANSION [SPANSION], AM49DL640BH56IS Datasheet - Page 20

AM49DL640BH56IS

Manufacturer Part Number

AM49DL640BH56IS

Description

64 Megabit (8 M x 8-Bit/4 M x 16-Bit) CMOS 3.0 Volt-only, Simultaneous Operation Flash Memory

Manufacturer

SPANSION [SPANSION]

Datasheet

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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 Table

6).

The hardware sector protection feature disables both

program and erase operations in any sector. The hard-

ware sector unprotection feature re-enables both pro-

gram and erase operations in previously protected

sectors. Sector protection/unprotection can be imple-

mented via two methods.

Table 6. Am29DL640H Boot Sector/Sector Block

SA11–SA14

SA15–SA18

SA19–SA22

SA23–SA26

SA55–SA58

SA59–SA62

SA63–SA66

SA67–SA70

SA71–SA74

SA75–SA78

SA79–SA82

SA83–SA86

SA87–SA90

SA91–SA94

SA27-SA30

SA31-SA34

SA35-SA38

SA39-SA42

SA43-SA46

SA47-SA50

SA51-SA54

SA8–SA10

Sector

Addresses for Protection/Unprotection

SA0

SA1

SA2

SA3

SA4

SA5

SA6

SA7

0000001XXX,

0000010XXX,

0000011XXX,

00001XXXXX

00010XXXXX

00011XXXXX

00100XXXXX

00101XXXXX

00110XXXXX

00111XXXXX

01000XXXXX

01001XXXXX

01010XXXXX

01011XXXXX

01100XXXXX

01101XXXXX

01110XXXXX

01111XXXXX

10000XXXXX

10001XXXXX

10010XXXXX

10011XXXXX

10100XXXXX

10101XXXXX

0000000000

0000000001

0000000010

0000000011

0000000100

0000000101

0000000110

0000000111

A21–A12

A D V A N C E

Sector Block Size

192 (3x64) Kbytes

256 (4x64) Kbytes

8 Kbytes

Sector/

Am49DL640BH

I N F O R M A T I O N

The primary method requires V

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

programming equipment. Figure 2 shows the algo-

rithms and Figure 26 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. Note that the sector unprotect algorithm

unprotects all sectors in parallel. All previously pro-

tected sectors must be individually re-protected. To

change data in protected sectors efficiently, the tem-

porary sector unprotect function is available. See

“Temporary Sector Unprotect”.

The alternate method intended only for programming

equipment requires V

This method is compatible with programmer routines

written for earlier 3.0 volt-only AMD flash devices.

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 Sector/Sector Block

Protection and Unprotection section for details.

Write Protect (WP#)

The Write Protect function provides a hardware

method of protecting without using V

one of two provided by the WP#/ACC pin.

SA103–SA106

SA107–SA110

SA111–SA114

SA115–SA118

SA119–SA122

SA123–SA126

SA127–SA130

SA131–SA133

SA99–SA102

SA95–SA98

Sector

SA134

SA135

SA136

SA137

SA138

SA139

SA140

SA141

10110XXXXX

10111XXXXX

11000XXXXX

11001XXXXX

11010XXXXX

11011XXXXX

11100XXXXX

11101XXXXX

11110XXXXX

1111100XXX,

1111101XXX,

1111110XXX

1111111000

1111111001

1111111010

1111111011

1111111100

1111111101

1111111110

1111111111

A21–A12

on address pin A9 and OE#.

on the RESET# pin

December 5, 2003

Sector Block Size

256 (4x64) Kbytes

192 (3x64) Kbytes

. This function is

8 Kbytes

Sector/

AM49DL640BH56IS SPANSION [SPANSION], AM49DL640BH56IS Datasheet - Page 20

AM49DL640BH56IS

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