DL161 datasheet(21/63 Pages) AMD

21 / 63 page

Am41DL16x4D

P R E L IMINARY

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 “The autoselect mode

provides manufacturer and device identification, and

sector protection verification, through identifier codes

output on DQ7–DQ0. The autoselect codes can be ac-

cessed in-system through the command register.

Refer to the Autoselect Command Sequence section

for more information.Sector/Sector Block Protection

and Unprotection”. The two outermost 8 Kbyte boot

sectors are the two sectors containing the lowest ad-

dresses in a top-boot-configured device, or the two

s e ct or s c ontai ning th e hi ghest addr es s e s i n 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 “The au-

toselect mode provides manufacturer and device

identification, and sector protection verification,

through identifier codes output on DQ7–DQ0. The au-

toselect codes can be accessed in-system through the

command register. Refer to the Autoselect Command

Sequence section for more information.Sector/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 Tables

10 and 11).

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 (8.5 V – 12.5 V). During this mode,

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.

START

Perform Erase or

Program Operations

RESET# = V

Temporary Sector

Unprotect Completed

(Note 2)

RESET# = V

(Note 1)

Notes:

1. All protected sectors unprotected (If WP#/ACC = V

IL,

outermost boot sectors will remain protected).

2. All previously protected sectors are protected once

again.

Figure 1.

Temporary Sector Unprotect Operation

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