AM41PDS3228DB10IS datasheet(19/59 Pages) AMD

19 / 59 page

Am41PDS3228D

May 13, 2002

P R E L IMINARY

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 requires V

ID on the

RESET# pin only, and can be implemented either

in-system or via programming equipment. Figure 2

shows the algorithms and Figure 26 shows the timing

diagram. This method uses standard microprocessor

bus cycle timing. For sector unprotect, all unprotected

sectors must first be protected prior to the first sector

unprotect write cycle.

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.

Write Protect (WP#)

The Write Protect function provides a hardware

method of protecting certain boot sectors without

using V

ID. This function is one of two provided by the

WP#/ACC pin.

If the system asserts V

IL on the WP#/ACC pin, the de-

vice disables program and erase functions in the two

“outermost” 8 Kbyte boot sectors independently of

whether those sectors were protected or unprotected

using the method described in “Sector/Sector Block

Protection and Unprotection”. The two outermost 8

Kbyte boot sectors are the two sectors containing the

lowest addresses in a top-boot-configured device, or

the two sectors containing the highest addresses in a

top-boot-configured device.

If the system asserts V

IH on the WP#/ACC pin, the de-

vice reverts to whether the two outermost 8 Kbyte boot

sectors were last set to be protected or unprotected.

That is, sector protection or unprotection for these two

sectors depends on whether they were last protected

or unprotected using the method described in “Sec-

tor/Sector Block Protection and Unprotection”.

Note that the WP#/ACC pin must not be left floating or

unconnected; inconsistent behavior of the device may

result.

Temporary Sector/Sector Block Unprotect

(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

8).

This feature allows temporary unprotection of previ-

ously protected sectors to change data in-system. The

Sector Unprotect mode is activated by setting the RE-

SET# pin to V

ID (9 V – 11 V ) . D u r ing this mo de,

formerly protected sectors can be programmed or

erased by selecting the sector addresses. Once V

ID is

removed from the RESET# pin, all the previously pro-

tected sectors are protected again. Figure 1 shows the

algorithm, and Figure 25 shows the timing diagrams,

for this feature.

Sector

Group

Sectors

A20–A12

Sector/Sector

Block Size

SGA0

SA70

111111XXX

64 (1x64) Kbytes

SGA1

SA69–SA67

11110XXXX

192 (3x64) Kbytes

SGA2

SA66–SA63

1110XXXXX

256 (4x64) Kbytes

SGA3

SA62–SA59

1101XXXXX

256 (4x64) Kbytes

SGA4

SA58–SA55

1100XXXXX

256 (4x64) Kbytes

SGA5

SA54–SA51

1011XXXXX

256 (4x64) Kbytes

SGA6

SA50–SA47

1010XXXXX

256 (4x64) Kbytes

SGA7

SA46–SA43

1001XXXXX

256 (4x64) Kbytes

SGA8

SA42–SA39

1000XXXXX

256 (4x64) Kbytes

SGA9

SA38–SA35

0111XXXXX

256 (4x64) Kbytes

SGA10

SA34–SA31

0110XXXXX

256 (4x64) Kbytes

SGA11

SA30–SA27

0101XXXXX

256 (4x64) Kbytes

SGA12

SA26–SA23

0100XXXXX

256 (4x64) Kbytes

SGA13

SA22–SA19

0011XXXXX

256 (4x64) Kbytes

SGA14

SA18–SA15

0010XXXXX

256 (4x64) Kbytes

SGA15

SA14–SA11

0001XXXXX

256 (4x64) Kbytes

SGA16

SA10–SA8

000011XXX

192 (3x64) Kbytes

SGA17

SA7

000000111

8 Kbytes

SGA18

SA6

000000110

8 Kbytes

SGA19

SA5

000000101

8 Kbytes

SGA20

SA4

000000100

8 Kbytes

SGA21

SA3

000000011

8 Kbytes

SGA22

SA2

000000010

8 Kbytes

SGA23

SA1

000000001

8 Kbytes

SGA24

SA0

000000000

8 Kbytes

AM41PDS3228DB10IS Datasheet(PDF) 19 Page - Advanced Micro Devices

AM41PDS3228DB10IS Datasheet(HTML) 19 Page - Advanced Micro Devices

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59

Datasheet Download

Link URL