AM29LV320MB datasheet(21/63 Pages) SPANSION

21 / 63 page

26518C3 January 31, 2007

Am29LV320MT/B

D A TA

SH EE T

If the system asserts V

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

vice reverts to whether the top or bottom two sectors

were previously set to be protected or unprotected

using the method described in Sector Group Protec-

tion and Unprotection. Note: No external pullup is nec-

essary since the WP#/ACC pin has internal pullup to

Temporary Sector Group Unprotect

(Note: In this device, a sector group consists of four adjacent

sectors that are protected or unprotected at the same time

(see Table 6).

This feature allows temporary unprotection of previ-

ously protected sector groups to change data in-sys-

tem. The Sector Group Unprotect mode is activated by

setting the RESET# pin to V

ID. During this mode, for-

merly protected sector groups can be programmed or

erased by selecting the sector group addresses. Once

ID is removed from the RESET# pin, all the previously

protected sector groups are protected again. Figure 1

shows the algorithm, and Figure 23 shows the timing

diagrams, for this feature.

Figure 1.

Temporary Sector Group

Unprotect Operation

START

Perform Erase or

Program Operations

RESET# = V

Temporary Sector

Group Unprotect

Completed (Note 2)

RESET# = V

(Note 1)

Notes:

1. All protected sector groups unprotected (If WP# = V

IL,

the first or last sector will remain protected).

2. All previously protected sector groups are protected

once again.

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