L640DU21NF datasheet(18/57 Pages) AMD

18 / 57 page

Am29LV640D/Am29LV641D

22366C6 January 22, 2007

D A 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-

gramme d with its corresponding 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 on page 12).

Table 3 shows the remaining address bits that are

don’t care. When all necessary bits are set as re-

quired, 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 Table 10 on page 28.

This method does not require V

ID. Refer to “Autoselect

Command Sequence” on page 24 for more informa-

tion.

Table 3.

Autoselect Codes, (High Voltage Method)

Legend: L = Logic Low = VIL, 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

VID

XLX

XX01h (protected),

XX00h (unprotected)

SecSi Sector Indicator Bit

(DQ7), WP# protects

highest address sector

(LV640DH/641DH), or

no WP# (LV640DU)

XLX

XX98h (factory locked),

XX18h (not factory locked)

SecSi Sector Indicator Bit

(DQ7), WP# protects

lowest address sector

(LV640DL/641DL)

VID

XLX

XX88h (factory locked),

XX08h (not factory locked)

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