L640GU53RI datasheet(18/55 Pages) AMD

18 / 55 page

Am29LV641G

June 14, 2005

ADV ANCE

I N FO RMAT I O N

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 c o rresponding progra mm ing

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 (8.5 V to 12.5 V) on address pin A9.

Address pins A6, 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 remaining address bits that are don’t care.

When all necessary bits have been set as required,

the programming equipment may then read the corre-

sponding 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 10. This method

does not require V

ID. Refer to the Autoselect Com-

mand Sequence section for more information.

Table 3.

Autoselect Codes, (High Voltage Method)

Legend: L = Logic Low = V

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

Note: SecSi™ Sector Indicator Bit (DQ7) exist only in the Am29LV641GH/L devices.

Description

CE#

OE#

WE#

A21

A15

A14

A10

DQ15

DQ0

Manufacturer ID:

AMD

—

XX01h

Read Cycle 1

—

22D7h

Read Cycle 2

0Eh

220Fh

Read Cycle 3

0Fh

XX00h

Sector Protection

Verification

X—

01h (protected),

00h (unprotected)

SecSi

™ Sector

Indicator Bit (DQ7)

X—

98h (factory locked),

18h (not factory locked)

SecSi

™ Sector

Indicator Bit (DQ7),

WP# protects highest

address sector

X—

XX98h (factory locked),

XX18h (not factory

locked)

SecSi

™ Sector

Indicator Bit (DQ7),

WP# protects lowest

address sector

X—

XX88h (factory locked),

XX08h (not factory

locked)

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