ES29DL320 Datasheet, PDF(9/59 Page) Excel Semiconductor Inc. – 32Mbit(4M x 8/2M x 16) CMOS 3.0 Volt-only, Simultaneous Operation Flash Memory

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ES29DL320 Datasheet, PDF (9/59 Pages) Excel Semiconductor Inc. – 32Mbit(4M x 8/2M x 16) CMOS 3.0 Volt-only, Simultaneous Operation Flash Memory

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ADVANCED INFORMATION

EE SS II

Excel Semiconductor inc.

be protected prior to the first sector unprotection

write cycle to avoid any over-erase due to the intrin-

sic erase characteristics of the protection cell. After

the unprotection operation, all previously protected

sectors will need to be individually re-protected.

Standard microprocessor bus cycle timings are used

in the unprotection and unprotect verification opera-

tions. Three unprotect methods are provided in the

ES29DL320 device. All unprotection and unprotect

verification cycles are summarized in detail at the

Table 1.

- In-system unprotection

- A9 High-voltage unprotection

- Temporary sector unprotection

In-System Unprotection

âIn-system unprotectionâ, the primary method,

requires VID (8.5V~12.5V) on the RESET# with

A6=1, A1=1, and A0=0. This method can be imple-

mented either in-system or via programming equip-

ment. This method uses standard microprocessor

bus cycle timing. Refer to Fig. 29 for timing diagram

and Fig. 4 for the unprotection algorithm.

A9 High-Voltage Unprotection

âHigh-voltage unprotectionâ, the alternate method

intended only for programming equipment, must

force VID (8.5V~12.5V) on address pin A9 and con-

trol pin OE# with A6=1, A1=1 and A0=0. Refer to

Fig. 32 for timing diagram and Fig. 6 for the unpro-

tection algorithm.

Temporary Sector Unprotect

This feature allows temporary unprotection of previ-

ously protected sectors to change data in-system.

The Sector Unprotect mode is activated by setting

the RESET# pin to VID (8.5V~12.5V). During this

mode, formerly protected sectors can be pro-

grammed or erased by selecting the sector

addresses. Once VID is removed from the RESET#

pin, all the previously protected sectors are pro-

tected again. Fig. 1 shows the algorithm, and Fig. 27

shows the timing diagrams for this feature.

WRITE PROTECT ( WP# )

The write protect function provides a hardware

method of protecting certain boot sectors without

using VID. This function is one of two provided by the

WP#/ACC pin.

If the system asserts VIL on the WP#/ACC pin, the

device disables program and erase functions in the

two âoutermostâ 8Kbytes boot sectors indepen-

dently of whether those sectors were protected or

unprotected using the method described in âSector

Group Protection and Unprotectionâ. The two outer-

most of 8 Kbyte boot sectors are the two sectors

containing the lowest addresses in a bottom-boot-

configured device, or the two sectors containing the

highest addresses in a top-boot-configured device.

If the system asserts VIH on the WP#/ACC pin, the

device reverts to whether the two outermost 8

Kbyte boot sectors were last set to be protected or

unprotected. That is, sector protection or unprotec-

tion for these two sectors depends on whether they

were last protected or unprotected using the

method described in âSector Group Protection and

Unprotectionâ.

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

or unconnected; inconsistent behavior of the device

may result.

START

RESET# = VID

(Note 1)

Perform Erase or

Program Operations

RESET# = VIH

Temporary Sector

Unprotect Completed

(Note 2)

Notes:

1. All protected sectors are unprotected (If WP#/ACC = VIL,

outermost boot sectors will remain protected).

2. All previously protected sectors are protected once again.

Figure 1. Temporary Sector Unprotect

Operation

ES29DL320

Rev. 0E May 25, 2006

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