AM29SL400D datasheet(13/41 Pages) SPANSION

13 / 41 page

April 13, 2005 Rev. A Amend. +1

Am29SL400D

ADV ANCE

I N FO RMAT I O N

Autoselect Mode

The autoselect mode provides manufacturer and

device identification, and sector protection verification,

through identifier codes output on DQ7–DQ0. This

mode is primarily intended for programming equipment

to automatically match a device to be programmed with

its corresponding programming algorithm. However,

the autoselect codes can also be accessed in-system

through the command register.

When using programming equipment, the autoselect

mode requires VID on address pin A9. Address pins

A6, A1, and A0 must be as shown in Table 4. In addi-

tion, when verifying sector protection, the sector

address must appear on the appropriate highest order

address bits (see Tables 2 and 3). Table 4 shows the

remaining address bits that are don’t care. When all

necessary bits have been set as required, the program-

ming equipment may then read the corresponding

identifier code on DQ7–DQ0.

To access the autoselect codes in-system, the host

system can issue the autoselect command via the

command register, as shown in Table 5 on page 17.

This method does not require VID. See “

Command

Definitions, on page 13 for details on using the autose-

lect mode.

Table 4.

Am29SL400D Autoselect Codes (High Voltage Method)

L = Logic Low = VIL, H = Logic High = VIH, SA = Sector Address, X = Don’t care.

Sector Protection/Unprotection

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. Sector protection/unprotection can be imple-

mented via two methods.

Sector protection/unprotection requires VID on the

RESET# pin only, and can be implemented either

in-system or via programming equipment. Figure 1, on

page 12 shows the algorithms and Figure 23, on

page 34 shows the timing diagram. This method uses

standard microprocessor bus cycle timing. For sector

unprotect, all unprotected sectors must first be pro-

tected prior to the first sector unprotect write cycle.

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 protected

or unprotected. See

Autoselect Mode, on page 11 for

details.

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. During this mode, formerly pro-

tected sectors can be programmed or erased by

selecting the sector addresses. Once VID is removed

from the RESET# pin, all the previously protected

sectors are protected again. Figure 2, on page 13

shows the algorithm, and Figure 22, on page 33 shows

the timing diagrams, for this feature.

Description

Mode

CE#

OE#

WE#

A17

A12

A11

A10

DQ8

DQ15

DQ7

DQ0

Manufacturer ID: AMD

VID

XLX

01h

Device ID:

Am29SL400D

(Top Boot Block)

Word

VID

XLX

22h

70h

Byte

70h

Device ID:

Am29SL400D

(Bottom Boot Block)

Word

VID

XLX

22h

F1h

Byte

F1h

Sector Protection Verification

VID

XLX

01h

(protected)

00h

(unprotected)

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