ds42585 Advanced Micro Devices, ds42585 Datasheet - Page 16

ds42585

Manufacturer Part Number

ds42585

Description

Stacked Multi-chip Package Mcp Flash Memory And Sram

Manufacturer

Advanced Micro Devices

Datasheet

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Autoselect Mode

The autoselect mode provides manufacturer and de-

vice identification, and sector protection verification,

through identifier codes output on DQ7–DQ0. This

mode is primarily intended for programming equip-

m e n t t o a u t o m a t i c a l l y m a t c h a d e v i c e t o b e

programmed with its corresponding programming al-

gorithm. However, the autoselect codes can also be

accessed in-system through the command register.

To access the autoselect codes in-system, the host

system can issue the autoselect command via the

command register, as shown in Table 12. This method

does not require V

mand Sequence section for more information.

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

7).

SA69–SA67

SA66–SA63

SA62–SA59

SA58–SA55

SA54–SA51

SA50–SA47

SA46–SA43

SA42–SA39

SA38–SA35

SA34–SA31

SA30–SA27

SA26–SA23

SA22–SA19

SA18–SA15

SA14–SA11

Table 7. Bottom Boot Sector/Sector Block

SA10–SA8

Sector

SA70

Addresses for Protection/Unprotection

SA7

SA6

SA5

SA4

1010XXXXX

1001XXXXX

1000XXXXX

0101XXXXX

0100XXXXX

0010XXXXX

0001XXXXX

000011XXX,

000010XXX,

111101XXX,

1110XXXXX

1101XXXXX

1100XXXXX

1011XXXXX

0111XXXXX

0110XXXXX

0011XXXXX

111110XXX,

000001XXX

111100XXX

111111XXX

000000110

000000101

000000100

000000111

A20–A12

. Refer to the Autoselect Com-

Sector/Sector Block

192 (3x64) Kbytes

256 (4x64) Kbytes

192 (3x64) Kbytes

64 Kbytes

8 Kbytes

Size

P R E L I M I N A R Y

DS42585

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. Note that the sector unprotect algorithm un-

protects all sectors in parallel. All previously protected

sectors must be individually re-protected. To change

data in protected sectors efficiently, the temporary

sector un protect function is available. See “Temporary

Sector/Sector Block Unprotect”.

Sector protection and unprotection can be imple-

mented as follows.

Sector protection and unprotection requires V

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.

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

WP#/ACC pin.

If the system asserts V

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 the bottom-boot-configured

device.

If the system asserts V

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”.

Sector

SA3

SA2

SA1

SA0

. This function is one of two provided by the

000000011

000000010

000000001

000000000

A20–A12

on the WP#/ACC pin, the de-

Sector/Sector Block

8 Kbytes

Size

on the

ds42585 Advanced Micro Devices, ds42585 Datasheet - Page 16

ds42585

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