AM29LV641DH121RPCE datasheet(18/57 Pages) AMD

18 / 57 page

September 20, 2002

Am29LV640D/Am29LV641D

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 co rresponding programm 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.

Description

CE#

OE#

WE#

A21

A15

A14

A10

DQ15 to DQ0

Manufacturer ID: AMD

0001h

Device ID: LV640DU/H/L,

LV641DH/L

22D7h

Sector Protection

Verification

XX01h (protected),

XX00h (unprotected)

SecSi Sector Indicator Bit

(DQ7), WP# protects

highest address sector

(LV640DH/641DH), or

no WP# (LV640DU)

XX98h (factory locked),

XX18h (not factory locked)

SecSi Sector Indicator Bit

(DQ7), WP# protects

lowest address sector

(LV640DL/641DL)

XX88h (factory locked),

XX08h (not factory locked)

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