M500000013 datasheet(24/70 Pages) SPANSION

24 / 70 page

May 19, 2003

Am50DL9608G

P R E L I M I NARY

Sector protection/unprotection requires V

ID on the RE-

SET# pin only, and can be implemented either in-sys-

tem or via programming equipment. Figure 2 shows

the algorithms and Figure 24 shows the timing dia-

gram. For sector unprotect, all unprotected sectors

must first be protected prior to the first sector unpro-

tect write cycle. Note that the sector unprotect algo-

rithm unprotects all sectors in parallel. All previously

protected 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 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

ID. This function is

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

If the system asserts V

IL on the WP#/ACC pin while

the Am29DL640G is enabled (CE#f1), the device dis-

ables program and erase functions in sectors 0, 1,

140, and 141, independently of whether those sectors

were protected or unprotected using the method de-

scribed in “Sector/Sector Block Protection and Unpro-

tection”. Similarly, the two outermost boot sectors

(SA0 and 1 on bottom boot devices or SA69 and 70 on

top boot devices) on the Am29DL320G are protected

when V

IL is asserted on the WP#/ACC pin while the

Am29DL320G is enabled (CE#f2).

If the system asserts V

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

vice reverts to whether the aforementioned sectors

were last set to be protected or unprotected. That is,

sector protection or unprotection for these sectors de-

pends on whether they were last protected or unpro-

tected using the method described in “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.

Table 12.

WP#/ACC Modes

Temporary Sector 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

9).

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. During this mode, formerly protected

sectors can be programmed or erased by selecting the

sector addresses. Once V

ID is removed from the RE-

SET# pin, all the previously protected sectors are

protected again. Figure 1 shows the algorithm, and

Figure 23 shows the timing diagrams, for this feature.

If the WP#/ACC pin is at V

IL while the Am29DL640G is

enabled, sectors 0, 1, 140, and 141 of that device will

remain protected during the Temporary sector Unpro-

tect mode. Similarly, If the WP#/ACC pin is at V

IL while

the Am29DL320G is enabled, the two outermost boot

sectors (SA0 and 1 on bottom boot devices or SA69

and 70 on top boot devices) of that device will remain

protected during the Temporary sector Unprotect

mode.

WP#

Input

Voltage

Am29DL640G

Am29DL320G

Disables programming

and erasing in SA0,

SA1, SA140, and

SA141

Disables programming

and erasing in SA0 and

SA1 or SA69 and SA70

Enables programming

and erasing in SA0,

SA1, SA140, and

SA141

Enables programming

and erasing in SA0 and

SA1 or SA60 and SA70

Enables accelerated programming (ACC). See

“Accelerated Program Operation” on page 11.

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