AM29LV640MH datasheet(18/62 Pages) AMD

18 / 62 page

Am29LV640MH/L

December 14, 2005

DA TA SH EET

Autoselect Mode

The autoselect mode provides manufacturer and de-

vice identification, and sector protection verification,

through identifier codes output on DQ7–DQ0. This

mode is primarily intended for programming equip-

ment to automatically match a device to be pro-

grammed 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 V

ID on address pin A9. Address pins

A6, A3, A2, A1, and A0 must be as shown in Table 3.

In addition, when verifying sector protection, the sector

address must appear on the appropriate highest order

address bits (see Table 2). Table 3 shows the remain-

ing address bits that are don’t care. When all neces-

sary bits have been set as required, the programming

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 Tables 10 and 11. This

method does not require V

ID. Refer to the Autoselect

Command Sequence section for more information.

Table 2.

Autoselect Codes, (High Voltage Method)

Legend: L = Logic Low = V

IL, H = Logic High = VIH, SA = Sector Address, X = Don’t care.

Sector Group Protection and

Unprotection

The hardware sector group protection feature disables

both program and erase operations in any sector

group. In this device, a sector group consists of four

adjacent sectors that are protected or unprotected at

the same time (see Table 4). The hardware sector

group unprotection feature re-enables both program

and erase operations in previously protected sector

groups. Sector group protection/unprotection can be

implemented via two methods.

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. This method uses standard microprocessor bus

cycle timing. For sector group unprotect, all unpro-

tected sector groups must first be protected prior to

the first sector group unprotect write cycle.

The device is shipped with all sector groups unpro-

tected. AMD offers the option of programming and pro-

tecting sector groups at its factory prior to shipping the

device through AMD’s ExpressFlash™ Service. Con-

tact an AMD representative for details.

It is possible to determine whether a sector group is

protected or unprotected. See the Autoselect Mode

section for details.

Description

CE#

OE#

WE#

A21

A15

A14

A10

DQ8 to DQ15

DQ7 to DQ0

BYTE#=

BYTE# =

Manufacturer ID: AMD

01h

Cycle 1

7Eh

Cycle 2

0Ch

Cycle 3

01h

Sector Protection

Verification

01h (protected),

00h (unprotected)

SecSi Sector Indicator

Bit (DQ7), WP# protects

highest address sector

98h (factory locked),

18h (not factory locked)

SecSi Sector Indicator

Bit (DQ7), WP# protects

lowest address sector

VID

88h (factory locked),

08h (not factory locked)

Table 3.

Sector Group Protection/Unprotection Address Table

Sector Group

A21–A15

SA0

0000000

SA1

0000001

SA2

0000010

SA3

0000011

SA4–SA7

00001xx

SA8–SA11

00010xx

SA12–SA15

00011xx

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